I have had my hands and feet hurt...hurt a lot! I, too, thought I might be getting RA because RA is in my family. Osteoarthritis is too. So, I really didn't want to know and just kept on doing my best.
My hands got so bad that I couldn't open jars. I bought a jar key and that helped. I also had a rubber disk that I put on the top and that help me get lids off. My daughter even bought me an electric appliance that removes lids because my hands were so bad. My right hand, expecially, around the thumb and the bone at the "thumb side" of my wrist. I could barely move my thumb and so holding a pen was next to impossible. I started practicing writing with my left hand. That bone on the wrist got hot and the muscles were inflammed. Taking ibuprofen did help with this. This went on for months and then started to go away. I not longer have that problem.
My feet were bad, too. I had the ball of my foot hurt and then the following year, the joints in a couple of toes. My foot even swelled some. My doctor though I might have gout and gave me medication but nothing worked. My feet problems aways happened in the winter and then clear up when the weather got warmer. BUT this year I didn't have the problem. I really think it's the vitamin D3 I am taking but time will tell.
So the bottom line is, I have had a lot of what you are describing and it has all gone away. I do think fibro plays into this. My fingers still lock a little. If I close my hand in a fist and then try to open it, my fingers will slightly lock and then pop when I get them straightened out. I don't know why but it isn't high on my list of priorities!
So, try to relax. Your being frightened about it will just make things worse. You will get to the bottom of this. Who knows? Maybe by the time August rolls around, they won't hurt! Let us know what the doctor says, okay? We really do care.
Sherrine