I did read your other posts but still did not see what other doctors you have seen or is it just the neuro and gp? I see you have to wait to get the biopsy. Have you had mris? What about complete bloodwork for auto immune like lupus for ex? I think you had stated your b12 was 480 and maybe someone can give input on that. If you have not had mris or complete bloodwork I would get them. The mri of the brain and spine. Sometimes doctors don't know what is going on but you should feel free to ask them to explain test results like the ? you stated on your most recent post. Also getting more opinions. Do you have support like a family member that can go with you? I know you want concrete answers and something to make this better. We all do but it is not often that easy and it can take time for the puzzle pieces to come together. Keep copies of all your records to bring to all your apts,ask questions if you are confused with your results.