As I understand it, from my reading here, disability goes by how you are physically and /or mentally limited from working.
The labels or the diagnoses aren't the most important part.

You have to be able to show by the records, forms you fill out, and medical proof, that you cannot work, and why - from pain, limited use of body parts, medications, side effects of medications, mental/emotional etc.

You have to have much more from the drs than just the diagnoses.

There's a thread on getting started that may have some tips to help you out.
Maybe some things were overlooked when you first filed.
Don't start your claim unprepared!!!
http://neurotalk.psychcentral.com/thread143444.html