Do you have any symptoms in the hands?

When you describe your feet, feeling like exploding... is this because they are swollen (throbbing)? Hot? are they discolored or change colors during the day? Are they worse some days than others? Sharp pain or aching throbbing pain?
Neurontin can cause edema in the extremities making compression on nerves and pain worse!
Have you tried Lidoderm patches?

Autoimmune disease is less common in males than females.
But it does happen.

Have you taken drugs that are known causers of PN?
http://neurotalk.psychcentral.com/thread122889.html

Some things other than spinal damage/compressions, are long term with PN.

Hereditary issues...genetic testing is needed for this. Charcot Marie Tooth and its variants.

Dietary issues... intolerance to gluten, dairy, nightshade veggies are often culprits

Circulatory issues... peripheral artery disease, more common in males who smoke, but can occur in anyone.

Diabetes... often pre-diabetic conditions can begin this process before blood sugars become high. This is called impaired glucose tolerance.

So there are many avenues to consider. Think back to what was going on with you when this started... what were you doing then? What antibiotics or cholesterol drugs were you taking?
Other drugs from the list I gave the link to?
Chemical exposures, hobbies etc?
Did you fall and hurt your back then?
Did you have an case of food poisoning, or infection?

Nerves get damaged from many things. Sometimes the trigger is hard to pinpoint, and we need to be a detective of sorts!