People with antibodies to nerves typically show more global symptoms. Hands, skin over the body, etc. The antibodies are not specific only to the feet and legs. In the beginning, they may be "first" but typically a more global presentation begins.
Since your symptoms seem centered on the feet, I wonder if you have been to a good podiatrist and have had a complete workup for mechanical issues there? Compression (Tinel's sign), spurs, plantar fasciitis, arthritis in joints, sesamoid bone problems, neuromas, etc.
Here is a good site with alot of info about foot pain:
http://www.northcoastfootcare.com/
look around that site... it gives lots of advice from how to lace shoes different ways to take the pressure off the instep, to the anatomy showing the nerve distributions and tendons, and many other helpful things.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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