I'm here for the prize.
Just kidding.
Yes I have a phobia, and I got mine in a similar fashion to how you got yours.
As a child I used to go visit my father's friends at a local University. Several of us children would go up and down the elevator all day long. There was a little tiny window on that elevator.
I ended up getting stuck in that elevator for something like 6 hours. The little window was just barely showing so that I could see out of it but nobody could see in to know that I was in there. To this day I can not stand confined spaces. I think a lot of the phobias that we have are actually based on incidents that happened during childhood.
However, just recognizing them doesn't mean you can make them go away.
Liked your story. I'll give you a nice upvote as a prize!
Hurray! That is a good prize!