Hi, I'd be tempted to ask for a referal to see a rheumatologist to check out whats going on. They will recognise and know if it is RA or something else. If the doctor you refer to is a rheumy then ask for a 2nd opinion with another one. Symmetrical joint pain is one symptom of RA but there are many more.
Don't give up go for another opinion, best wishes, golitho