Mental health issues are classified into various categories based on specific symptoms, causes, and patterns of behavior. Here are some of the main classifications used in the field of mental health:

1. Anxiety disorders: This category includes disorders such as generalized anxiety disorder, panic disorder, social anxiety disorder, obsessive-compulsive disorder (OCD), and post-traumatic stress disorder (PTSD). These disorders are characterized by excessive worry, fear, or nervousness.

2. Mood disorders: This category includes disorders such as depression, bipolar disorder, and seasonal affective disorder (SAD). These disorders are characterized by persistent and extreme alterations in mood and emotions.

3. Psychotic disorders: This category includes disorders such as schizophrenia and delusional disorder. These disorders are characterized by a break with reality, including hallucinations, delusions, and disordered thinking.

4. Eating disorders: This category includes disorders such as anorexia nervosa, bulimia nervosa, and binge eating disorder. These disorders are characterized by disturbances in eating behavior and body image.

5. Personality disorders: This category includes disorders such as borderline personality disorder, narcissistic personality disorder, and antisocial personality disorder. These disorders are characterized by persistent and inflexible patterns of thinking, feeling, and behaving that cause significant distress and impairment in relationships and daily life.

6. Substance abuse and addiction disorders: This category includes disorders such as alcohol use disorder and substance use disorders. These disorders are characterized by compulsive drug-seeking and use despite negative consequences.

It’s important to note that mental health conditions can overlap and co-occur with each other, and this classification system is not meant to be exhaustive or definitive. A mental health professional should be consulted to accurately diagnose and treat mental health conditions.

There can be many reasons why someone feels sad all the time. Some possible causes include:

1. Clinical depression: This is a mental health disorder characterized by persistent feelings of sadness, hopelessness, and a lack of interest in life activities. Depression can also cause physical symptoms such as fatigue, changes in appetite, and difficulty sleeping.

2. Chronic stress: Prolonged exposure to stress can lead to feelings of sadness and can also increase the risk of developing depression.

3. Grief: The death of a loved one, the end of a relationship, or other significant losses can trigger feelings of sadness and grief.

4. Life changes: Major life changes such as a new job, a move, or the birth of a child can also cause feelings of sadness, especially if they are accompanied by stress or uncertainty.

5. Medical conditions: Certain medical conditions, such as hypothyroidism or anemia, can cause symptoms of depression and sadness.

6. Substance abuse: Substance abuse, including alcohol and drug use, can also lead to feelings of sadness, especially when the effects of the substance wear off.

7. Side effect of medication: Some medications can cause feelings of sadness as a side effect.

It’s important to seek professional help if feelings of sadness persist and interfere with daily life. A mental health professional can assess the underlying causes of sadness and develop an appropriate treatment plan.

The feeling of confusion or the mental fog indicates lack of clarity in your thoughts or when you are unable to find a way to do something. This is common unless it is making you indecisive or confused. 

Feeling confused all the time can happen when:

1. You have to take a decision but have plenty of options. 
2. Lack of motivation or finding something meaningless.
3. You had a strong belief that got contradicted by your experiences.
4. You have no clue on a certain problem that needs to be solved.
5. You might be getting gaslighted.

These were the psychological reasons for staying confused all the time. There are psychiatric and neuro-psychiatric reasons for confusion too. 

Consumption of Alcohol, weed and psychotic drugs can cause constant confusion. More serious causes include neurological factors such as suffering from dementia.  

Feeling nervous while talking to people is a common experience and can be caused by several factors, including:

1. Social anxiety disorder: This is a mental health disorder characterized by excessive fear of being judged or scrutinized by others in social situations. People with social anxiety disorder often feel nervous or self-conscious in social situations, including speaking to others.

2. Low self-esteem: Feelings of insecurity or a negative self-image can lead to nervousness when speaking to others.

3. Lack of social skills: If you have limited experience interacting with others, you may feel nervous or unsure of how to engage in conversation.

4. Past experiences: Negative experiences in social situations, such as bullying or rejection, can create a negative association with speaking to people and increase feelings of nervousness.

5. Performance anxiety: Feeling nervous in speaking situations can also be a result of performance anxiety, especially if the situation requires speaking in front of a large group of people.

Breakups can be painful for many reasons, including:

1. Attachment: When we form a romantic relationship, we form an attachment to our partner. Breaking that attachment can be difficult and result in feelings of loss, sadness, and grief.

2. Emotional investment: When we are in a relationship, we often invest time, energy, and emotion into the relationship. When that relationship ends, it can feel like a loss of something valuable.

3. Memories: The memories and shared experiences of a relationship can also contribute to the pain of a breakup. Reminders of those memories can trigger feelings of sadness and loss.

4. Fear of being alone: Breaking up can raise concerns about being alone and not having someone to share life’s experiences with.

5. Low self-esteem: If the relationship ended because of something the person did or said, feelings of self-doubt and low self-esteem can increase the pain of the breakup.

6. Anticipatory grief: The process of ending a relationship can be distressing, even before the actual breakup takes place. Anticipating the end of the relationship and all the changes that will follow can lead to feelings of sadness and grief.

It’s important to remember that healing takes time, and everyone’s healing process is different. If the pain of a breakup becomes overwhelming, it’s important to reach out to friends, family, or a mental health professional for support.

Dealing with stress can be challenging, but there are several effective strategies that can help:

1. Exercise: Regular physical activity, such as jogging, walking, or yoga, can help reduce stress and improve overall well-being.

2. Relaxation techniques: Techniques such as deep breathing, meditation, or progressive muscle relaxation can help calm the mind and reduce stress.

3. Time management: Prioritizing tasks and setting realistic goals can help reduce feelings of overwhelmed and stressed.

4. Social support: Spending time with friends, family, or a support group can provide a sense of connection and help reduce stress.

5. Healthy diet: Eating a healthy, balanced diet can improve overall well-being and provide the energy needed to manage stress.

6. Sleep: Getting enough sleep is important for both physical and mental health. Aim for 7-8 hours of sleep per night.

7. Mindfulness: Mindfulness practices, such as paying attention to the present moment and focusing on one’s thoughts and feelings, can help reduce stress and improve overall well-being.

8. Limit caffeine and alcohol: Consuming too much caffeine or alcohol can increase feelings of anxiety and stress.

It’s important to find the strategies that work best for you, and to make them a regular part of your routine. If stress becomes overwhelming, it’s important to seek help from a mental health professional who can provide support and guidance.

The decision to see a psychologist or psychiatrist depends on the nature and severity of your symptoms and the type of help you need.

A psychologist is a mental health professional who is trained in the diagnosis and treatment of mental health problems. They use therapy and other psychological techniques to help people understand and manage their symptoms. Psychologists generally do not prescribe medication.

A psychiatrist is a medical doctor who specializes in the treatment of mental health problems. In addition to therapy, psychiatrists can prescribe medication to help manage symptoms.

If you are experiencing symptoms of a mental health condition, such as anxiety, depression, or obsessive-compulsive disorder, and you would like to explore therapy as a treatment option, a psychologist may be a good place to start.

If you have a more serious or persistent mental health condition, such as schizophrenia or bipolar disorder, or if you have not responded well to therapy alone, a psychiatrist may be the better choice. They can provide a comprehensive evaluation, including a medical evaluation, and help determine the best course of treatment, which may include therapy, medication, or a combination of both.