First off all, I can't understand how it is possible that a so called doctor, can distroy all your records, that is crazy.
I am very sorry, that you had to listen to these very rude people disgussing your right to apply for disability. They don't know sh.t, just ignore them.
Maybe you have to start from scratch, find a rheumy who will record everything and go from there. I am thinking, that you will need a doctor to offically diagnose you with RA and go from there.
Good luck to you.
I may have been dealt a bad hand, but at least I'm still playing with a full deck. ( most of the time anyway).