Hello Roy,
the best thing you can do in a siutation like this when you are feeling anxiety ridden is to continue to go to places with high roofs. Deal with it with postive self talk, reassure yourself that nothing will happen. That is key.
Try not to avoid anything that makes you become anxiety ridden, that is giving into the anxiety and then it will become a phobia.
There are alot of tecniques to help you deal with this issue.
Even self help books can teach you coping methods, therapy, talking to someone about this fear.... and doing something everyday that makes you anxiety ridden.
I'm sorry that you are having such a hard time right now.
Hang in there.
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