I have been having severe burning pain for 1 1/2 years and lost 50 lbs in 4 months. no doctor seems to have any answers. 15 years ago i was diagnosed with b12 deficiency ?? ms. my evoked potentials suggested demylenation due to both legs and eyes being delayed on testing. nothing showed on my mri however. new evp (evoked potentials) shows delays on both legs but no delay on eyes. Another forum neuro suggested testing be done for small fiber neuropathy ( sweat test and skin punch biopsy) however doctors i have seen are not considering that. they don't like it when patients look elsewhere for answers. Does anyone know if small fiber neuropathy can cause delays in evoked potential testing? I would really appreciate any answers....who knows, that information, if answer is yes, may help me get sfn testing.

thank you very much!!