@nurse49
Have you been tested for Chronic Inflammatory Demyelinating Polyradiculoneuropathy (CIDP)? It requires a spinal tap to test for specific proteins, etc. I read that it can cause double vision.
https://my.clevelandclinic.org/health/diseases/cidp-chronic-inflammatory-demyelinating-polyneuropathy
I also have SFN and many symptoms. I see a new neurologist at the end of April and will ask to rule out MS and CIDP.

Good luck getting answers and treatment for some relief of your symptoms and improved quality of life. I used to love to dance and be productive and active but I am reduced to 10%-20% of what I used to be able to do and dealing with major depression as a result. I am 54 and not sure what the future holds with such a low quality of life at this point.