You will find "hormonal imbalance" casually mentioned as a cause of PN in a few places, but it is not well understood as best I can tell.

Did you PN start when you became pregnant? Maybe a change in hormones which obviously happens during pregnancy is part of the issue.

http://www.hopkinsmedicine.org/healt...opathy_134,51/

"In many cases, a different type of medical problem, such as a kidney condition or a hormone imbalance, leads to peripheral neuropathy."

https://my.clevelandclinic.org/healt...hic-neuropathy

"Systemic diseases — Systemic diseases are those that affect the entire body. These include diabetes--the leading cause of peripheral neuropathy--kidney disorders, certain cancers, and hormonal imbalances."