just keep your cool, close your eyes and control your breathing, imagine that everything is okay and take any negative thoughts out of your head
When we experience panic attack we sometimes forget that this life has been outlined or forgot that God is great above all the problems we face, for that should be when we experience panic attack the first thing we must do is remember God then pleaded with Him pacified our hearts and eased all our affairs because everything that happens in this world is by His will.