My 22 year old brother already suffers manic depression until one point he threatened to kill himself after splitting my head open for no reason. My mum finally persuaded him to go to the GP but I don't think he did as he seems to still get random moments where he gets extremely aggressive and bi-polar and he can't seem to control it. A couple of years ago I remembered actually thinking he was Bulimic when he was being sick straight after a meal then denying it. He shows every sign and symptom of Bulimia and even my younger sister thinks so. I am certain he has it. However when I tell him I'm concerned and tell him I've noticed everything he does, he gets very agitated and denies everything and almost laughs it off! I tell him I won't mention it to mum if he just goes to a GP but he completely denies it.
He masks it very well from my parents, and they don't seem to notice or understand how serious I think his mental health problems are. I'm no expert but I can tell he is extremely insecure about himself, and his mental health is not stable at all. I feel so sorry for him and I want to help him but he won't co-operate can someone please help what should I do? How do I get him to see a GP bearing in mind he gets extremely aggressive if I say the wrong thing?