Hi Cymbalta, I have recently been diagnosed with Complex Regional Pain Syndrome in the right arm, I have now been on 100mg of Lyrica for approx 2months, with regards to side effects, I have none, however I don't really notice much difference in my pain levels either. I realise that the arm and back are different, but perhaps it may work for you. It is worth a try, however I have been told it is also a medication that you come off very slowly if it doesn't work as if you stop taking it suddenly it can be quite dangerous. Anyway not sure if any of this helps. Hope you find some sort of relief. Good Luck