http://www.ssa.gov
Go to the disabilities link
It's a lengthy application and you will need doctors to fill out certain portions to verify your disability have a record of ALL of yor hospitilaizatuons at least 10 years back an md what for current and past treatments, diagnosis all doctors seen tests run ie mris or cat cans etc the more you have the better included any surgeries reason for time off work all awnser thourghouly and truthfully hood luck