I’m the same. As a kid ,heights didn’t bother me at all. When we went to the World Trade Center I couldn’t go near a window, same with the top of Rockefeller Center. Grand Canyon I stood as far away from the edge as I could get. I can’t even stand to see other people in high places. Window seat on a plane, no problem.
The older I get, the worse it gets.
Try the mule ride down to phantom ranch!