Flying alongside a TCU looking up and then looking down gives me the eebie jeebies. Also, when flying gliders and I'm just below the base of a cloud building speed, same thing. It gives me the exact feeling as if I was on the hughest indoor trampolin about to jump. It's not the feeling of that it's a long way down, it's more like the fact of having a structure so close to you're head and still being so high up. I really cant explain it.
I do some climbing, mostly indoors. It's god fun and gives me sort of the same rush. Also it's a way for me to work with my fear in a controlled environment and I get to push my self as far into my fear as I wish. Anybody with a fear of heights (or whatever the fear that we agreed it was) should try it.
/LnS