Can you get your doctor to support your case? Either by writing an in depth history or by coming to the hearing with you? Might help.
My mum went though hoops that caused her to be so much more ill than she was when she went for disability... she ended up in a hearing and was told she may have to testify, but a good supporting letter by the GP and a good social worker meant it never came to that, she only had to sit outside and wait for the verdict.
She now has high level disability for life, though I've recently learned that life does not mean life and she may be called back at any time. It never ends!
Best of luck with your hearing,