Hi there,
sorry about your difficulty.
you might see a therapist like browneyes suggested, (everything she said was right on) because someone who specializes in anxiety can show you techniques to lessen the duration and intensity of episodes. for starters. and an added plus, you can learn to recognize when and how it effects you, and can find out how your body signals work when it's about to come on (sometimes).
good luck. money well spent!
peace,
nightbird