Peripheral Neuropathy can be from metabolic causes.
Low thyroid (this is what I had) or prediabetes (when you still have normal fasting glucose, but are prone to low readings during the day) can begin the process of diabetic neuropathy.

You can visit our forum here, and read and search some topics.

There are supplements that help people with certain types of neuropathy. B12 is the first to investigate. But with the new research out there, mitochondrial damage is becoming a more
discussed trigger. Some drugs damage the mitochondria and lead to PN. One common group is the fluoroquinolones like Cipro and Levaquin and Avelox. You wouldn't think of it...taking them for a bladder infection or bronchitis, but PN may be down the road for those patients. Also the statins used for lowering cholesterol, and some other drugs are causers.
Acetyl carnitine is often used for drug/toxin induced PN.

Here is the link to our PN forum:
http://neurotalk.psychcentral.com/forum20.html

There are some foot disorders that cause pain too.
Plantar fasciatis, neuromas, arthritis, and damaged sesamoid bones cause alot of grief. So a visit to a good podiatrist may reveal a reason.

Having weakness in the legs may change your gait, and put pressure on the feet...a podiatrist may be able to help with this.