Very curious on this...
My step-mom told me when she first met me, she thought I had Parkinson's due to some little shakiness in my hands. She noticed this has sort of subsided. I never had issues with heights and balance though and last year it somehow developed.
So that brings me to the question. I know they tell people with Parkinson's to actually avoid heights... but are they actually afraid heights? I think I might have an inner ear issue, due to the fact that I feel off balance when I get higher up.