My friend David has had Schizophrenia since college. He received 3 business degrees, top in his class until this happened. He got into drug during college and at the age of 38 his doctor changed his medicine to some other kind, by the time he was 42 he lost his eye sight. He is on disability and in a nursing home now at the age of 62,, My worry is just a year ago he and i would sit on his porch and had long conversations as thou nothing was wrong with him but now he has trouble talking and keeps seeing things that aren't there, really often, and he is blind. Why is he having so much trouble like this all of  a sudden??? I'm so worried about him.