Two strategies that helped me when I was having my attacks:
1. Get some of the cinnamon flavored Altoids. Put one or two on your tongue when you feel an attack coming on. In the same way that stubbing your toe will distract you from your hand hurting, the point is to distract yourself from your panic. If it's bad enough chew them.
2. Find a recording of someone talking people down from attacks. There are lots out there. I've found them in the app store on my phone and also on the Amazon music store. It'll talk you through an attack, talk you through relaxing your body and muscles, remind you that this is not a permanent condition, that this too shall pass, etc. It has worked for me.
Good luck!