I narrowed Mz Migraine post to mental disorders. I can only speak for Florida, in Florida you had to have a physical and mental disorder to qualify, but I have seen people on here with just mental disorders who qualified. Your illness has to cause you not be be able to do substantial gainful activity and residual function capacity.
http://www.ssa.gov/disability/profes...ders-Adult.htm
Here is an additional link that may help you.
http://www.disabilitysecrets.com/page9-16.html