Brian wrote you a great post on diabetes, and gives good advice. My take is that you need someone excellent to handle the diabetes (prediabetes is a silly concept) and get that under control. The ulnar neuropathy needs to be explained. Where is it from? The wrist? The elbow? It is NOT typical of small fiber neuropathy to get a neuropathy of a single LARGE nerve like this. That's more typical of compression. It's not even something that looks like it's from a spinal disk. So I'd want to know why the ulnar neuropathy.

In terms of the burning feet...You probably have your cause right in front of you, in terms of the diabetes, but if you want a better workup, it looks like you need another neurologist.

Many doctors are threatened by patients on the internet; others just don't realize that an intelligent person can distill out the good information from the worthless. If he hasn't looked at the net from a patient's perspective, he doesn't know. He doesn't sound like someone to have an ongoing relationship. Depending on where you live, you might a very good general neurologist (many of them are excellent), or another neuro who calls himself a neuropathy specialist. Or, I might be safe to just get the diabetes under control---as long as you have someone good and caring taking care of you---you can always go for more tests if it goes in the wrong direction after taking care of the sugars/insulin.

But I'm not sure that whatever explains the feet explains the ulnar symptoms.

It's possible to have termites AND ants, my own neurologist told me.