Have you had a caloric ear test ? It compares the right to left ear.

I did have caloric testing, and I came out symmetrical - which surprised the audiologist. He was sure there was going to be an issue, but there wasn't. I was highly symmetrical. But, he did say that I was hypersensitive on my left side - which also shows up in my reflex tests at the doc's. I'm thinking it was trauma though, as it reminded me of when I first fell, as that's the feeling I had laying down.

How about testing of your vertebral artery ?
No - that has not been tested? There was an MRA done, and it came out okay - is that testing the artery? My blood pressure sitting and standing are okay -they've tested both as I've stood and sat in succession.