Have you ever thought of trying accupuncture, I was suffering terrible back pain and was given all sorts of pain relief and that was the only thing that eased the pain, unfortunately mine turned out to be cancer of the spine and I was addmitted to hospital but if I had a pain like that again i would for sure have accupuncture again, think about it , it really does work, I know what you are going through, there's nothing worse than back pain it seems to affect the whole of your body, have a word with your gp you can get it under the NHS.