Just a note or two for those of you who are interested in how this works. (Well, how we think it works because we really don't know much about the brain!).
Those parts of your brain responsible for feelings and fear (specifically the amygdala and hippocampus) work on the basis of association. So rational thinking, logic, and reality are nothing for those parts. And those parts can be very specific in what it associates with fear or anxiety. That is why you can be happy and addicted to flying at 10 000 feet in a glider, or parachuting but intensily fearful and anxious of a 15 foot ladder.
fs