I'm not sure what he thinks. Like I said I've lived the last 3 years with thinking I have CRPS. I still might have it I fit many of the signs for that. All this neuro stuff seams to be all connected in one way or the other. Different people are affected in many different ways. I just know all my symtoms not just the fatigue are getting worse. I just got the results from my perietal antibody test and they were negative. So what is causing my B12 to be low? I guess we figure that out and we might have a few answers. I read that if you have a demyelinating neuropathy that the body will use up its stores of B12 in an effort to slow nerve demyelination. They did a spinal tap but I'm not sure what he was checking for. My neuro doc isn't the easiest person to communicate with. He didn't even now what glia is.