Has anyone experienced this? I had this several years ago. They did x-rays and the bone was fine. Couldn't find anything. Now it is back. and it hurts down my arm into hand, which both hands are pretty numb. So I'm not sure if the two are related.

Do you have any other neck, upper back, chest, arm pit pains or tightness?
Can you hold your arms in the stick em up position while opening and closing your hands for more than a couple minutes without any problems? {that's just a little test to see it symptoms arise, not a definitive test at all though}
My hands will start to tingle and turn white in 40 seconds or less, because the blood flow is getting pinched off to the arms in that position.

If so you might want to read on our TOS forum useful sticky thread to see if any of it sounds to fit.
Thoracic Outlet Syndrome {TOS} forum
http://neurotalk.psychcentral.com/forum24.html

I used to get that, when I had bone crushing MS fatigue. I couldn't hold my shoulders in an upight position, so one side or the other would become very painful.

Since LDN, I haven't had that kind of fatigue..

Please feel better..

F2U, hope you can find out what's going on...