My son slowley but surely had gotten himself where he did not want to go anywhere ouside the house. He has been like this for over 4 years. He only talks when he has to. He is not delusional. He is not violent, nor suicidal.He does not have crazy episodes and he does take care of himself. I have tried therapy, medication and tried to talk to him all the time. He is nonresponsive.He is 25 years old and I can't force him to go to the doctor because he is of no threat to anyone. I don't know what to do next.