Mrsd, my sister also avoids citrus because she has found it causes her arthritis to worsen.
I've been reading this thread with interest, since I've got an apt with a rheumy in March. My fingers, wrists, elbows and shoulders finally got to aching so bad (when it "flares") that I went to my GP, who made me the apt to see the rheumy.
I've been GF for several months now, and have started to rely heavily on potatoes. Boy, I hope that doesn't turn out to be something else I've got to give up! I eat little citrus or tomatoes, but the potatoes and potato flour/starch have come to be staples in my diet.
Hugs,