Some have benefited from Epley Maneuver therapy to reorient the crystals. Most PTs and Vestibular Therapists can do it.

There is a rare disorder that can impact the inner ear. I think RussiaRulez has posted about his experience with it. Maybe his posts can be found in a search.

What is the Stanford consult about? UCSF has a very good concussion clinic, too.

I have had mild nystagmus in my left eye for decades. My doc would not do a VNG.