In my childhood I took swimming lessons so one day the coach asked the kids to jump from the platform. The pool had 1m, 3m, 5m and 10m high platforms. I could not pass the 3m for anything in the world. I had to back-up from the 5m and 10m because I could not even look down; kids laughed I felt bad but life goes on. I hike, went to over 2000m in the mountains but I do not get close to cliffs. I also have a problem when spinning as in going into rides at Wonderland and this kind of activities; It is not fear but rather sickness. I almost faint couple of times in the past so I stay away. Are these phobias connected (at the brain level...)?