I haven't applied for disability, but I do keep a notebook with my symptoms, especially if anything changes. Before I take this to the doctor, I go over it and try to condense it the best I can.
It does seem helpful, and I think it's probably helpful to the doctor, too.
Hope this helps a bit. Have a great (hopefully positive and low-or-no pain) week!
"If God brings you to it, He will bring you through it."