In addition to your self care and continuing to encourage him to get help, if you ever feel that he is a danger to himself or others, you can call the law enforcement agency in his area and request a welfare check. They will send someone to make sure that he is okay and if he isn't, they will make sure that he gets some help. This really sounds like a monumental task that you have taken on, and we can't emphasize enough how important it is that you have boundaries, take care of yourself, get support for yourself, and keep trying to get him to get treatment. Even if you were a trained mental health professional, you couldn't treat his disorder from 700 miles away. You can tell him that too, and other concerns you may have.