I was told by a psychologist that this is a fear, but I'm not really afraid. When I am on high things, bridges, tall buildings with balconies, mountain cliffs, I get this urge (not overwhelming, but very strong) to jump.
I am also afraid of ferris wheels, skyway rides and flying. I feel different with these three than other times I am up high. Maybe it's because I am strapped in or something, but I feel almost like a panic attack is coming on. I can fly, but I read a book as soon as I sit down, and use some exercises my doctor gave me to alleviate some panic. Once we take off, I am much better. And, I hate mice. I had a mouse a year ago last September, and felt like a prisoner in my house. I was afraid to walk anywhere.
My biggest fear has always been crowds, but, again I have exercises that I use and can do okay as long as I prepare ahead of time.