I was having problems for 4 years, and my symptoms were identical to my sister's, who was diagnosed with Fibromyalgia. I managed to clear up 90% of it with meditation and relaxation techniques. My sister said that wouldn't work for everyone, and some of the causes are physical.
For me though, I know I'm constantly tensing and could literally feel the tension melting away one day when doing some relaxation. After a couple days my legs and ankles felt 100% improved. (I mean over a couple days I'd take time for a few mediation/relaxation "sessions."... I did this at home, by the way.)Then I "focused" on my arms, shoulders, finger, base of my thumb... that got better in about three days. It was kind of like a miracle cure, but since nobody believes in miracle cures, I guess I better avoid using that term.

I'm not selling anything... there's plenty of info on the net about meditation. To me, it wasn't a miracle anyway, I know I tense a lot, and have trouble relaxing. So I wasn't at all surprised that all my pains, burning, stinging, "under the skin itching" was caused by the constant strain of being tense. Doctors said to exercise, but that often made it worse or didn't help at all. They never said to do the opposite, to just do nothing.
Unfortunately it takes practice to get really relaxed and to concentrate. I started kind of infrequently doing some types of relaxation exercises three years ago. After a while, I could fall asleep in five or ten minutes a lot of nights. But for all my life, it would take me an hour to fall asleep, I just didn't know that I could turn my mind "off." and didn't know that when I laid down to bed, I shouldn't just let my thoughts do whatever they wanted, I could actually control them. I was talking to my mother about a month ago, and she said, "yeah, when I go to bed, whenever I start thinking, I remind myself to stop. I've done that most of my life." Oh gee, thanks for telling me NOW, mom!

Oh well, she didn't know. We tell kids to "go to bed." but not, "Go to bed and stop thinking."