--certainly diabetes is the most common cause of neuropathy, and I bet your primary physician sees it as an "open and shut" case.

Still, even people who have a very apparent cause of neuropathy could benefit from a neurology consult; some other testing might be done, to rule out co-morbidities, and a good neurologist should have more insight in to how to control symptoms, and might even have some insight into nutrition and other factors that might help control the diabetes and possibly help with symptoms. You need a good one, though, who specializes in neuromuscular disorders--not one who specializes in multiple sclerosis, or stroke, or some other subspecialty in which s/he doesn't see neuropathy patients often. (Does Norman have a university/teaching medical center, or could you get to one in OKC or Tulsa? Those might be place to start looking.)

Moreover, if you are diabetic, you should have a good diabetic endocrinologist in your corner--they normally know more about this than your average primary physician.