Welcome to WHL.
The only advise I can give you, is to find another Rheumatologist, he is the only one, who can answer your question.
There are so many different AI ( autoimmune diseases) out there, it is difficult to pinpoint which one you have, or if you may have a mixture of several.
The bad things about these AI's are, they are very hard to diagnose and it sometimes takes months or years to get a clear answer.
A new rheumy will first take a extensive bloodtest and go from there.
I hope, that you will get answers and treatment soon.
I may have been dealt a bad hand, but at least I'm still playing with a full deck. ( most of the time anyway).