First, let me say that I know very little about VA benefits and disability determinations. I wonder if you had PTSD due to abuse in childhood while in the army if they would see that as a pre-existing condition and therefore not covered by VA disability. The second thing is that you might consider talking to a lawyer after you have obtained as many records as possible. The first visit is usually free and if they sue and win then they get a percentage of your disability... if they lose then there is no charge in most cases.

I have a friend who has been trying to get VA disability for years because of a slip-and-fall while in the service. He has talked about his attempts to get the disability for years with no end in sight.

Although it may be just the thing to apply for VA benefits, you might want to get a copy of your records with your psychiatrist both to apply for the benefits and to see if you can get SSD. However, if you aren't currently seeing a psychiatrist and psychologist there won't be much support for your application. It never hurts to try.