I know Tom_Diane mentioned that Cymbalta is an anti-depressant and that is correct. But is is also prescribed for chronic pain without going "off label". It has several approved uses, and chronic pain is one. It works differently from pain killers and narcotics. I have been taking it for several years now, and it really seems to help. If I really overdo it, I do occasionally have to take a "real" pain pill, but only rarely.
The interesting thing to me is how often chronic pain and depression seem to go hand in hand.. help either and the other has to get better. I know when I was in constant pain, I was not a happy camper.