In answer to the original question, I had very little fear of heights pre MM. I loved roller coasters and have been skydiving. As a kid I used to climb to the top of pine trees and enjoy the swaying of the tree's trunk in the breeze. I would climb up on the roof of the house and hang out, or climb onto the roof of the garage and jump off for fun. Post MM, I still have little fear of heights but don't trust myself. For example when we visited the Grand Canyon it took me a fair while to get right up to the edge for a proper look. I can't ride on roller coasters as they give me a nasty dose of seasickness. Being up high definitely gives me an uneasy feeling due to my screwy vestibular system. but it's certainly not fear.