The reason I ask about the hallucinations is because here a Beautiful Mind it says that Nash was delusional, rather than having hallucinations. There is some bias, however, as the site is against the current classification and treatment of schizophrenia within the psychiatric/psychological field. However, the author of the article did have a phd in psychology, which adds validity to the argument. He agrees that the film is a romanticization, and also says that the initial treatment for Nash HURT, rather than helped him. I do disagree with him on one point though, he says that Nash's illness disappeared of its own accord. I've read elsewhere that he still struggles, but manages.
In my opinion schizophrenia, more than other mental illnesses, all of which the psychiatric community tend to regard as mostly chemical in nature, is an illness induced and fostered by cultural/communicative factors. I think, as you kind of do raga, that schizophrenics and people who suffer from some other mental illnesses, do share some of the same characteristics (biological and personal) that highly-creative people do - namely, that they are extremely sensitive and receptive to their environment, and qualify it differently from how the majority of people do. I talk about this in one of my posts maybe one or two pages back.
And mental illness runs in my family as well. Schizophrenia has particularly been of interest to me because of the reasons listed above. Also, I have noticed schizophrenic tendencies, which sometimes worry me, in my own personality. People also consider me highly creative.