Hello, Catherine. Welcome to a2k.
A bunch of folks here share having rheumatoid arthritis, and they may post when they check into the site.
I know a little bit about it from my old laboratory days, but not as a clinician, and my comments aren't all that useful, any knowledge I have being old, unless I can figure out where to direct you.
The doctor you are talking about is a rheumatologist, and the subject is rheumatology. You will get fed up with those words - but the people I used to know in that field of medicine were good people.