I would say having them come back normal is a relief.
Now refresh my memory, since I am going senile lately....you did have a + ANA, and have autoimmune issues, right? I remember some mention of Sjogren's. It is a cause or associated with PN.
My neuro is an autonomic specialist, and I really like him. I think your doc gave you good advice. My doc stopped short of running the Athena panel, and I would still like to have it done, even with clear cut autoimmune disease. My theory is one can have both.
Given I had RLS as a kid, makes me wonder.
Anyway, yes, go see the autonomic specialist. They see more cases of autonomic neuropathy, thus, know more about it.