--you likely know by now that there are many possible causes of neuropathy, and the work-ups to find them can be very long (and expensive), but that many people don't have doctors that are experienced with neuropathy and who stop investigations prematurely.

Have you looked at the Quest/Latov serological testing for potential neuropathy causes:

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

. . .and the Liza Jane spreadsheets:

www.lizajane.org

These papers explain how people with small-fiber neuropathies often don't present with abnormal tests on standard examinations or even on nerve conduction studies or electromyography (EMG):

http://www.ccjm.org/content/76/5/297.full

http://www.thecni.org/reviews/13-2-p07-treihaft.htm