People have different kind of phobias. I get sick if I am expose to heights. However, the funny thing is, if I am in a little cable car or snugly sitting down, then, I no longer care. But if you ask me to walk along the corridor of a high rise building of say more than 9 storeys, I feel pukey.
However, my most feared thing is being in enclosed, tiny places. That is why I hate any expedition that involves caving or go into tiny elevators. I will get goosebumps and I even have goosebumps thinking about this!