'A Beautiful Mind' is a fantastic movie, but, as you implied, it's fundamentally a different story. The book is where it's at: http://www.amazon.com/A-Beautiful-Mind-Sylvia-Nasar/dp/14516...

I will also say that it's impossible to over-state the breath and depth of the varieties of experiences that stem from what is called schizophrenia. There are certainly groups of people who share somewhat similar symptoms, but even that is tenuous. Words simply can't adequately describe it.