I know your post is old, but you describe some things VERY similar to mine - I’m trying to locate a physician to conduct the biopsy test for SFN & believe it’s definitely in the Non-Length Dependent SFN realm caused by AI diseases. Ruled out MS & others w/ MRI’s/CT’s/X-rays but along with your left side face tingle and the right cheekbone/ear situation you mention, my neurological symptoms are a daily battle. I’m only 41 yrs old and would love any knowledge you have learned in your journey!