Any time you choose a surgical option around the spinal cord, the best they can offer you as a success rate is 50%. Trust me, I've had 2 major surgeries to reduce the pain and get off the meds. Nothing will ever "fix" or "cure" it and there will always be pain, in fact it causes all new pains from the trauma of the surgery itself. If you can't handle the pain and meds any more, I'd suggest asking to be referred to a highly reputable Neurosurgeon and have them make the assessment. They will then give you what options are available and the risks involved.

One medication that is often overlooked and has had great success recently in this area is Topamax (Topiramate), used as a nerve blocker. It worked for me for a while.

If you have any questions, or want some specifics; send me a pm.