Hi Moggy, yeah it sounds as if you're going to need a doc to suss it all out. It could easily be from your back, bursitis or even osteo???
My rheumy was telling me its less common these days to have hip joints involved with RA because of all the good meds around. I keep getting hip pain, but she doesn't feel its RA based, probably from some old injury acting up.
Hope you manage to get some answers soon, golitho