Lots of interesting posts here. I recently got an attack and am reminded of how scary they are. All the possibilities rush through my mind associated with not being able to fight my way into another normal breath. The 'toolbox' that I now carry, somewhat alleviates that fear. Breathing techniques and mindful distractions are my first responses. But I have also found humming to be nice, visualizing my goals, and simply working on my posture has helped. When I was unfamiliar with what was happening to me, I started with very basic breathing, counting and muscle flexing techniques. Those techniques helped me let go of immediate tension. If you have the resources, maybe take up a new hobby to incorporate these techniques in a more advanced practice