Hi Michele, even though that you know you have diabetes it is still a good idea to get checked out properly by the PN experts to make sure there isn't something else contributing to your nerve damage as well.
Just a skin punch biopsy without any other testing is very slack, there are many more standard tests that should have been done, at the very least an EMG should have been done as well to see if there was any large nerve involvement, even if you not showing any signs of it, at this present time.
I am glad you seen that the first neuro was incompetent when it comes to Neuropathy, that's nothing unusual, many of us here have sacked lots of neuro's that don't have a clue when it comes to PN.
good luck anyway
Brian