Panic attacks always go away, That's the first thing you have to remind yourself when having one. "It feels like the end of the world, but it's just a feeling. When the adrenalin is exhausted, the panic will subside." While telling yourself this, almost anything you do to distract yourself will help. You can run, do pushups, or breathe into a paper bag. Breathing into a paper bag changes your blood chemistry, making it richer in carbon dioxide, which slows down your breathing. This simple solution is free and it works.