Hi, I appreciate your concern for your brother. On the face of it, he appears to be suffering from moderate Depression but may require a detailed evaluation. Depression can be caused due to various factors - interpersonal problems, career stressors etc. Homoeopathy medicines can help to target the root cause and hence treat effectively with long term benefits without side effects.
Next Steps
It is advisable to approach a clinical psychologist for detailed evaluation and seek medication from psychiatrist (Allopathy / Homoeopahty).
Health Tips
Try not to keep him alone as much as possible. In case of any further queries, you may contact me via Practo online portal