I have a friend with a problem like autism, mental illness, or a learning disability. I keep trying to get him to get checked out by a professional. He doesn't believe he has a problem. He thinks he's just different like a lot of people are different. I try to tell him nicely that he is on another level of different which is not healthy or good. Anyone that knows him can clearly see it. Others try to tell him the same things and he doesn't listen. How do I get him to get professional help?