I've never had an issue with heights. In college I was a certified arborist and would swing around in trees, wielding a chainsaw. Later, when I graduated, I did source emissions testing (smoke stack testing). I remember climbing a 500' ladder up a coal plant stack with no cage or fall protection, so I could tie off the sample lines, telling myself "it's just 50 ten foot ladders" the whole way.
Now I routinely climb and work on scaffolds inside power plants with no issues. I briefly had issues when I had progressive glasses and then mono-vision lasik. That gave me issues with depth perception and balance when working at heights.