My gelding is a tester, and has crow hopped with me quite a few times to see what he can get away with. I had a similar problem- I was deathly afraid of riding. My trainer/lesson giver that I lived with for a several months made me ride every day, and wouldn't let either me or Milo quit until we were both relaxed. In the beginning, those were some long lessons for the both of us
Now if he crow hops, he gets a swift smack on the ass and spun in a tight circle, and it seems to be working for us.
Any further advice I can give you, though, is to find somebody to give you lessons, who can see you from the ground and coach you on training. It helped a lot for me.