This is surely a hard situation for you. I guess like kaliope said you could try to get him to go see a doc for meds or a therapist but it will ultimately be up to him to get help. I hope you find some answers. I have never been very good at making someone help themselves. I tried this with my mom too many times.

Welcome to PC. Keep reaching out here and at home. I wish you the very best here. Others may have some more feedback for you.