Hi Tiger
I think there are lots of different types of fears of heights, I'm happy as Larry on a knife edge ridge, but hate looking off high man-made things. For what it's worth, I've got a completely unfounded theory about one type of fear of heights. I spent quite a lot of time walking in the alps and although I could be on a wide enough path, if I looked down a steep slope into a big valley I felt really dizzy. I think it was because my brain just wasn't used to looking down and seeing something 3 miles away, rather than 3 feet away. Anyway, I found if I just sat down and spent 15 minutes or so looking at the view and getting my brain used to it then I was fine after that.
Quite fancy one of those Ironman things, is it horrible though?
Cheers
Dunk