Yep, I knew that from your first post but you did ask to hear about my fear of open heights
I do think though that how it manifested is similar to what you describe. I've not flown a helicopter and would guess the Robinson R22 is very twitchy. What I would experience was a strong sense I would fall during turbulence and feelings such as if I banked the plane it would topple over on its back. This problems went away in time.