If you are able, make an appointment to see a neurologist, so you can get an idea of what the extent of his PN is. Skin biopsy is the gold standard for testing for PN, it won't always show on EMGs or other tests.

25% of PN is idiopathic, the rest is due to some other disease and PN is a symptom of that condition. I would like to know if something is brewing or if it is idiopathic.

Yes, PN can be significant. It can be a harbinger of another disease, or on its own, it can become autonomic.