Hi angelinafina
Exact same thing here. (See my "false pretences" thread.) Tested twice for RA, both times negative, anti-inflammatories help.
I get a lot of it in the hands because I play bass and use computers a lot. I thought I was going to have to stop playing, then my doctor called it an "occupational hazard" of playing bass so I saw it in a different light then.
Keep moving is the thing, especially for hands and fingers. When I feel them stiffening up, I do a bit of air piano or air guitar, and also do the exercise where you press each finger in turn against the thumb, as fast as you can for as long as you can. My daughter who is a trainee physio advised exactly the same thing so I was quite pleased I'd thought that up all by myself. Bend and stretch everything, don't let it seize up.
Dunno about the feet. Mine are weird. Some days they feel ok (except for a slight crampy feeling to the two smallest toes on my right foot, and I am pretty sure that's gotta be arthritis of some sort) and some days they really hurt. It feels like I am walking on hot pebbles.
I find it gets worse if I cross my legs so I try not to do that. My hubs is under instructions that if he sees me cross my legs or rest my elbows on the table he is to tell me to stop doing it.
Also, like enough, rainy weather aggravates it, and it is also worse at certain points in the hormonal cycle.
Anti-inflammatories, ibuprofen gel, those are the things that help the best.
And I also use a wrist strap when playing guitar and sometimes when driving.
I sleep flat on my back with my hands at my sides, that way I don't crook them over or lie on them when I'm asleep. That helps too.
Oh, and get your workstation checked over ergonomically, at home or at work if you use computers a lot. Chairs, table height, all kinds of things can make a huge difference.
Finally - don't freak out! There are loads of us going through the exact same things! I can't begin to tell you how much the members of this site have helped reassure me.
You're one of them - just by being another person with the exact same symptoms as me.