--begs to be investigated for autoimmune, toxic, and some nutritional causes.

I do sound like a broken record with this (and there's a reference made for people over 40), but I highly doubt people have had comprehensive serological work-ups for neurological symptom causes unless they've been to specialty centers or practices (often at major research hospitals). For instance, most doctors know to test for anti-nuclear antibodies, and eliminate vascular/connective tissue autoimmunities if these come negative, but few have the expertise to test for specific antibodies to peripheral nerve components.

And this is why I always direct people to the very comprehensive Liza Jane spreadsheets, so they can compare what they've had tested and track results over time:

www.lizajane.org


. . .as well as the Quest/Latov paper on serological testing for neuropathy:

http://www.questdiagnostics.com/hcp/...eralNeurop.htm