Your neuro should not be threatened by another neuro's opinion. If NCV tests show PN than it is safe to say you have PN. Often, PN starts in the smallest nerve fibers which is not picked up well on NCV. If you have FM, then chances are your CNS will have a hypervigilant state to pain signals. So if PN is sending more pain signals to your brain, then due to FM, you will hurt "more." There is evidence that FM patients may have more substance P in their CSF. This is evidence that FM may be a "real" diagnosis, and not the hypochondriacal malady that half of doctors think it may be.