Welcome to NeuroTalk:

I think you should visit our Peripheral Neuropathy forum and
start to read. Diabetes is sneaky and there are things YOU can do besides take serious RX drugs which do NOTHING for the process you are going thru. They only hide symptoms.

http://neurotalk.psychcentral.com/forum20.html

Are you taking any medications? Statins, or oral drugs for your diabetes? Statins are known to cause PN. Metformin, often used in type II diabetes, can deplete Vitamin B12.

First off you need an accurate assessment of B12 status. Please get a test if you haven't already, and get the numbers and post here. You should be at least at 400 US units. Post your concentration if not in the US.

Magnesium is lost by diabetics thru the urine. When it becomes low, all sorts of problems start to appear as magnesium is essential in hundreds of reactions in the body. When low many nerve issues appear, as well as muscle cramping and weakness.
Here is our magnesium thread:
http://neurotalk.psychcentral.com/thread1138.html

Also very important is Vitamin D. Many people have low Vit D levels, and when this happens your immune system is weak and cannot fight off infections and viruses.
Here is our Vit D thread:
http://neurotalk.psychcentral.com/thread92116.html

These are just starting points. For diabetics there is also a useful supplement called lipoic acid. This specifically can help with neuropathy. We discuss this on the PN thread often.

There is alot of information on this forum, and people who have helped themselves when doctors reach a point of uselessness. So pull up a chair and a cuppa, and take advantage of our information and support.