I'm not quite sure about all the medical terms you were using, but it sounds a lot like my back problems. I've been through the whole shot thing for at least three years, and nothing ever helps. My pain specialist seems to think that shots are the only answer. I don't know what it would take for him to prescribe adequate pain medication.
Please let me know if you get any treatment that helps out with the pain.
I would strongly recommend anyone with back pain to see a doctor of osteopathic medicine (DO) who specializes in neuromuscular medicine or osteopathic manipulative medicine (OMM). The DO degree is equivalent to an MD degree (i.e., they go through four years of medical school + residency, can prescribe meds, do surgery, etc.) but DOs receive additional training in relieving symptoms of musculoskeletal problems with manual techniques. There's a lot they can do for people with chronic back pain. They can prescribe medication if necessary, of course, but it might be worth a shot for you to try some OMM...