What Causes Back Pain Despite Taking Gabapentin After A Fusion Surgery?

I have nerve damage from a Back fusion surgery and have burning across the top of my hips. I m taking two herbal products, which are working, but I m still having pain in my back. I can t stand up straight and have pain on my right side. My husband and I feel that this last major surgery was really screwed up. The first four major surgeries went extremely well. My pain management Doctor has removed me from my pain medication do to all the hip about get addicted to it. I m taking Gabapentin, but it really doesn t do anything for the pain. I have a nerve blocked in my back for the left side. Do you have any suggestions for how to deal with this issue? Thank you, Cheri