It would be dangerous to treat without having clear definition between the neurological and psychiatric issues, so please be careful and at least talkto neurologist. The treatment of choice for your condition is any of the SSRI medications -Lexapro, Celexa area couple. Celexa may be lower cost as it has been around a while. Walmart often has low cost drug programs and sometimes manufaturers will help with cost.
Also, you should apply for Medicare or one of high risk pool insurances available under new health care act. (sorry, I don't know how - you state insurance comissioners office will, just call)