Hi Aussie:
My neuro has diagnosed me with small fiber PN. He did a nerve conduction test/EMG and based on the results made the diagnosis. He didnt feel the need to do the skin test, apparently. I didn't know that racing heart, anxiety and BP issues were related to small fiber PN. It's interesting sice my entire episode began with the fatigue and then a period of weeks where my heart raced before all the neuro stuff started. And the anxiety has been horrific. Its improved significantly sice my B12 and B6 levels were restored. I couldn't even sit for a haircut without severe panic symptoms.
Thanks for calling my attention to the autonomic connections with small fiber. I'll call my neuro tomorrow.