This is my thread listing and discussing DRUGS that may cause PN in some people. Most doctors will not go to this subject, because of liability and fear they will be blamed. Some idiopathic PNs are results of RX drug use in the past.

http://neurotalk.psychcentral.com/thread122889.html

The biggest offenders are the fluoroquinolone antibiotics, Flagyl, and statins for cholesterol.

Burning only on the bottoms of the feet is odd. Usually a larger area is involved. I'd try dusting your feet with a good antifungal powder, double rinse all socks so there is no soap residue in your clothing. Sometimes fungal infections lie dormant below the skin esp if you have had athlete's foot in the past. Then you can get burning, but no lesions when it activates a bit.

Burning really responds to Biofreeze. This cools off the nerves and blocks the burning sensations:

http://www.amazon.com/BIOFREEZE-Pain...ords=Biofreeze

Amazon has free shipping on this, and Biofreeze is not commonly in stores. If you do find it locally it can be as much as $15.00.
You can also apply to the top of the foot..as many nerves go thru there too.

Some foods will also cause burning. The biggest offenders are nightshade veggies. If you avoid all tomato, potatos, peppers, hot sauce (jalopenjoes) for 2 weeks, you can see if your burning reduces in intensity.

Histamine in foods can also cause burning and tingling:
http://neurotalk.psychcentral.com/sh...ight=histamine

MSG often found in processed chips, sauces, and Chinese food is also hard on nerves. Monosodium glutamate will trigger the NMDA pain receptors.