P.K.
I had pain as well, and my pain shot through my right butt cheek as well and made it feel like a dull knife was in my back. I can't remember when it went away, but I remember it was at least 6 months, because I went back to work at 6 months and sat at my desk in pain. The pain is gone now. My doctor said it was because there was a nerve that was effected by the needle going in and that it would probably pass in time.