Hi. I am on neurontin and many times a dose needs to be up to 3500 I think that what was my pain doc said for adequate pain relief. When I was increasing it was 300 at a time and now am up to 2700. I am stuck there since I hate the side effects with each increase and more so at the higher doses. Sometimes a more of combo of meds is needed too. I had a nerve block which did not help me but some it does. Did you have an mri of the brain and spine? Have you looked at the rsd board? Why I ask is cause the burning and also how you were a runner plus the unexplained pain. I have PN and RSD. It is important to find the why but sometimes for me that has not been found and I am diagnosticly tested out so the next step was pain treatment. That is where a good pain doctor who is an anestesolgist comes in. Have you see one cause who was going to preform the block? I would see one because they could give you better direction on meds and other treatment but also may give you driection on more what is going on.