Welcome to NeuroTalk:

Are you taking other drugs (not the PN ones)....like perhaps a statin for cholesterol?

Diuretics like lasix or hydrochlorothiazide? Something for blood pressure?

Have you had Vit D and B12 tested to see if you are low in either or both? Improving Vit D levels in diabetics helps with pain.
B12 you should have done and get the numbers exactly....In the US the ranges have NOT be amended to reflect new low that is recommended now for the past 10 yrs. The new low should be 400 US units, and anything below that is no longer "normal".
Taking a supplement would then be indicated and our B12 thread is here:
http://neurotalk.psychcentral.com/thread85103.html

If you are a poor methylator and have the generic errors in MTHFR enzymes your nervous system will become damaged unless you use the active form of B12 called methylcobalamin.
You could also be low in folate, as it is methylated to be biologically active by the same system.

If you took Cipro or Levaquin or Avelox recently, for Metronidazole (Flagyl) this can also damage nerves. Statins
also can cause nerve damage.

Many common RX drugs will deplete nutrients, causing nerve symptoms. Diuretics deplete B1 and magnesium and potassium.
ACE inhibitors for blood pressure deplete zinc over time.
Acid blocking drugs for the stomach block absorption of B12, folate, magnesium, calcium, zinc and iron.

So first off, you need to look at your life and recent past, to see if something you consumed has caused this to happen. Then we can move on the supplements that help diabetics...
lipoic acid
acetyl carnitine
CoQ-10 (must be taken with statins)

also, edit to add:
Have you had vaccines recently?
And what do you do for a living, and hobbies...toxins can come from that part of your environment.

Have an illness or food poisoning recently?