Sad,
My goodness, I wonder how or why you would need to exercise with all you do at your job. I too deal with Osteoarthritis, it's in my hips, knees, back, and I suspect my fingers too cause they are starting to get stiff and achy alot.
Also if you are hurting like that after exercise it sounds like your body it trying to tell you no, stop, this is not helping!
I have fibro too, and every antidepressant I have tried makes me really sick. And you know what? For me personally I think it would not help much to take something for depression that will put alot of weight on me. That would make me more depressed!
I hope you you are able to find a way of getting some kind of relief. You may need something else for break thru pain. Maybe you can talk to your doctor about it.
You may even want to consider a less strenuous job. That could probably help alot, if your able to that is.
Let us know how things are going.
Blessings
Debbie