[btilly]

The current Scientific American has an article you may find interesting on the biology behind certain kinds of chronic pain. In particular there is a certain kind of cells called glia whose job is to heal hurt neurons. They consider active pain neurons to be hurt, try to "heal" them, and increase the sensitivity, leading to a nasty feedback loop as anything will cause pain.

There are treatments being developed for this kind of pain. But one of the more effective existing ones is marijuana. Marijuana dials down the glia, which breaks the feedback loop. If you live in a state that allows medical marijuana, you may wish to look into this.