I had a nerve ablation on my lower back over a year ago. I have had no lower back pain since then, as my doctor said it could last 6 months or more. I was nervous about the pain of the procedure but it wasn't at all what I was expecting and I recovered very fast. If you haven't inquired about that possibility, ask your pain doctor. I would not be doing injections as the side effects of the injections can be bad for your body.