Great that you got lots of good advice so far.
I didn't know about my fear of heights until my mid 20's when I went hiking in Greece along some of the paths hugging the cliffs. It surprised me.
ie. a problem for me: high trestle bridges with wide gaps between the floor slats and if the bridge has no barriers/rails when cycling or walking over it.
I just simply need a high enough barrier. THis is applicable for road bridges which may have barrier that is not high enough.
I am not the person leaning much over our home highrise balcony. We live over 30+ stories high.