went to neurology appt today. He did a very simple exam... testing for L/R equality in tone, some balance tests, listened to chest, back, neck. took a lot of notes on my account of what's going on, then I left with instructions to follow up with ENT and ophthalmology (about the pupil difference), and also with some vestibular exercises to improve balance. He said, depending on what ENT and Ophth say, could mean neurotology for a high-res image. I got home and he called to say he looked into it further, scratch ENT/Ophth, and go to neurotology for the high-res image to check for Tullio's Phenomenon. It's not the cause, but it's a symptom, so it's might narrow down the reasons for my conditions.