I don't understand why the doctor shot you 15 times. No matter what medication you received to help the labor pain, once usually does it. Anyway I think you may have nerve damage. Maybe the doctor hit some nerves in the back and once a nerve is damaged there is no going back. However, there is anti-seizure medications that help nerve damage. My aunt had back surgery and had nerve damage and the anti-seizure medication worked a great deal. Find a good pain management doctor. You may have to see a dozen before you find one but keep trying. Good Luck.