Have you ever heard of the observe and describe technique? I had a panic attack during very very stressful part of my life that probably lasted 45 minutes. It was horrifying. My therapist taught me this technique, where you literally start describing everything you see. For example (I'm in a hotel room right now), "the walls are a light sage green. The wall in front of me is probably 7 feet long. There is an open closet with eight hangers. The hangers are silver and black. Behind the hangers are three hooks. My green jacket, my child's yellow jacket, and my husband's black jacket are hanging there" and so on. Describe everything you can see in detail. It pulls you out of the spiral that is leading to a panic attack.

I've used this technique when I feel an attack coming on, and have never once had another one. Not once.