First of all you described small fiber sensory neuropathy along with autonomic neuropathy. You are experiencing the same issues I’ve had for 13 years. Because it’s slowing your heart rate it shows the autonomic neuropathy is killing the nerves in the top part of your heart. My heart is so bad I have a pacemaker and am now on hospice. These neuropathy’s usually occur together. It’s unfortunate but this is the gift that keeps on giving ( sarcasm). What has helped me with the symptoms is medical marijuana gummy bears, and Bupropn HCL 300mg XL and Kratom. It was by accident I was placed on this medication and it has taken my symptoms from a 10 to a 3. I’ve deteriorated bad enough I am now on hospice.
Most physicians don’t have a clue what this disease is like and how horrible it affects every aspect of your life. Unfortunately there is no cure and the only thing you can do is treat the symptoms.