I had a series of injections over a course of 4 months, but none of them worked for me. But at the same time, I told my doctor(pain and management) that my legs and feet started to feel slightly numb, which he ignored. To make a long story short. I had a pinched nerve, besides lower back pain. If it wasn't for my primary care doctor, I might have lost all feeling below the waist. I had an emergency operation to relieve the pinched nerve. So, stand up for yourself, do research, and if needed, get a second opinion.