Hm. The fact that you tested negative for RF doesn't necessarily mean no RA. Especially with the edema last time, I can't help but be somewhat suspicious. Has anyone suggested seronegative RA? Hm.

I also have gotten something like that, and it was the one and only time I tested postive for anti-nuclear antibodies.

I think PT and heat are the main treatments for RA joint pain. TENS unit if you can get your hands on one.