well, you could go out in a storm, or when its cloudy out and such.
I bet it would only take a few times go out in such weather, until you "realized" that there was nothing to be scared of.
Also, when i was talking to my psychology teacher last year, i told him i wa scared of bee's and wasps and other things that fly and sting.
He said it wasnt really a fear, because it can cause pain.
But similarly, my fright of bees is exaggerated.
I would say the same thing about yours - except that in this case it seems to be very exaggerated,
Anyways, good luck, i hope you find something that works.