Hi
It sounds like your brother is upset and anxious. It seems like he could be depressed. You have noticed a change in his behaviour. He was a very talkative and caring person and now he is silent and afraid of everything around him. Since two years he has been gaining weight. It looks like he has gotten into a pattern of emotional eating. You feel he could be smoking and drinking and it could be due to anxiety and depression. It is necessary to know if your brother has lost interest in doing things he enjoys such as his hobbies.
Your brother will require professional help from a psychiatrist and psychologist. If the symptoms are severe he can consult a psychiatrist first and later consult a psychologist.
I understand you are worried about your brother. He will require great support from his family. Let him know you are there for him. It is important for you to feel calm and positive.
Your brother will need to consult a psychiatrist and psychologist.
Do take care of yourself.
Next Steps
Consult a psychiatrist and psychologist
Health Tips
Contact me for counselling session. Along with counselling I can suggest natural foods to calm the mind.