I just read this book about a woman who went pretty much psychotic turned out to be in a strange auto-immune reaction. It was gripping. She was initially misdiagnosed and told to stop "partying," but her condition was grave and the cause was very obscure. It's called Brain on Fire, by Susan Cahalan. http://www.amazon.com/dp/B007EDOKZW/ref=pe_385040_118058080_TE_M1T1DP