M.,
Years ago, I had an odd pain/tingling feeling in my hands that I could not pin-point. I was an athlete back then and this would become worse during my races (I was a runner), with my whole hand going numb sometimes by the end of a race. I saw many sports specialists and serveral surgeons, but no one could identify the problem and I was eventually advised to seek meditation or relaxation therapy (I think that's the clinical way of say, "it's all in your head").
Anyway, for an unrelated matter (some mild back pain from an injury sustained earlier), I went to see a chiropractor. During the initial consultation, he asked me about any other problems I was having. I almost said, 'none...', but decided to tell him about my wrist/back of hand pain and the numbness. Well, even before he look at my x-rays, he said he thought I had damaged something in my neck and explained how since nerves all go through the spinal column that sometimes pain that actually originates there can seem to be elsewhere in the body. Which is also why it isn't very specific to a particular location. Basically, as he explained it, my vertebrae were mashing on one of the nerves that went to my arm and the signals were getting messed up going back to my brain indicating that the problem was in my hand and not in my neck.
He suggested that my neck had been injured at the same time my lower back had been, but because the injury was worse in my back, I had not noticed the injury to my neck at the time.
Well, to make a long story longer (sorry, I just realized this is coming off as some kind of chiropractic plug), he gave me adjustments to my neck and my hand/wrist pain went away.
I don't know if you think you might have injured you back somehow during the lifting, but that made me think about my situation. I've also known someone who thought they had carpal tunnel and went to see a chiropractor and the wrist pain went away.
It's hard to find a good chiropractor (I think I just really lucked out that first time), but I have a good one in Irving (would be quite a drive from where you are, though). I would suggest seeing a chiropractor or an osteopath who might be able to evaluate the condition of your spine to see if there might be an injury of some kind there.
Also, having said all that... I hurt something in my shoulder last year and it STILL hurts when I move my arm a certain way or lift at a certain angle (and hurts quite a bit when it does). The best the doctors (including the chiropractor) can tell me about that is that it is "tendonitis". I believe that tendonitis must take a long time to heal (if ever) or it's the catch-all phrase used by doctors when they can't diagnose your pain.
I know that wasn't all that helpful, but I do think that since the pain moves around, it is actually originating somewhere else and your brain is getting mixed signals.
I hope you feel better soon.
P.