@johnbishop
Out of curiosity I think you said you were diagnosed with SFN? SFN is diagnosed by skin punch biopsy and large fibre is detected by EMG and or nerve conduction study. Or so I was told but I was diagnosed with large fibre sensorimotor polyneuropathy not too long ago with both emg and nerve conduction. I wander if that explains the numbness, balance problems as those are more large fibre and small is known for pain. I alway wandered why I didnt have pain but I initally wasnt told I had large fibre but just the blanket term neuropathy. I am curious as I know a person can have both small and large but always wandered if once diagnosed with large they would even bother to check for small? I checked on google and it seems to correleate:

“Standard EMG and NCS tests only evaluate large nerve fibers and large motor or sensory units. Because small unmyelinated or thinly myelinated fibers do not significantly impact large muscle or nerve electrical conduction profiles measured by these needles and surface electrodes, an SFN patient typically has a completely normal EMG/NCS result“