I agree that you need a new neuro that can run more tests. Do you have a major hospital or teaching hospital near you? Has your gp done a full set of bloodwork? If not I would also encourage that for things like auto immune,b12,blood sugar. Was the mri just of the lowe back and not the spine or does that cover both? What about of the brain? Hang in there and I hope you find someone who is willing to work with you.