I had panic attacks prior to POTS. The first one was after a high carb meal and it ran the gammut...all the way through hyperventilation and tingling extremities (thought I would pass out but never did). Once I knew what it was, I recognized my next one and counteracted it by lying with my feet elevated, my husband fanned me, I took a pinch of Valium, and talked to myself so that I could breathe normally. I didn't use a bag although that would help but I just used pursed lip breathing and slowed it down. The panic attack stopped (I was on my way to my dads funeral so I knew what was going on at the time). Since being diagnosed with Dys, my attacks are completely different. I have IBS-D really bad, get nauseated, sometimes my heart races with increased breathing but sometimes not. And I usually get my other Dys symptoms (dizziness, ringing in the ears, pulsating sound, cold hands/feet, tingling and anxious feeling=fight or flight). I don't even pay them much attention now and they tend to go away quickly and do not escalate. There is power in knowledge and if you know what is going on in your body, it can help you mentally & possibly improve your symptoms. I so hope you get where you can cope with whats going on b/c this stuff is miserable!