I started getting panic attacks in college, where I was an octaganal peg in a triangular hole.
After my dad died, and my mom needed me, I worked out a ritual, and convinced myself that, if I did the ritual, I wouldn't have an attack.
It worked, at least most of the time. Coming from Presbyterians and Methodists, my ritual involves a prayer, which doesn't mean yours needs one. That's just what I did.
When you feel an attack coming, try to remember something complicated. I would try to remember the Scottish highland dances I did in high school. Recipes would work, or card games, or verb conjugations, or anything that will take your brain away from the damn attack.
Most important is to remember that this is just another goddam panic attack, like the last one. It will go away.
Look at it as an enemy that wants to wreck your life, and spit in it's eye.   
I had a honey of an attack a couple of years ago, coming home from the airport. I got off a very crowded bus, and into some cool, fresh air. It went away.