I would definitely see your primary doctor about that. I've seen several different ER doctors for different problems, and one of them basically told me, "My job is to make you're not dying. You're not, so go home." As long as your vitals are stable, they typically don't really care how you feel. But that is extremely high and I think you are right to be worried (although not TOO worried, because if there really was something life-threatening going on, I think the ER doc would have realized it). [
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On a sidenote, I'm very curious as to how you got rid of your panic attacks. I don't believe we are allowed to drift off topic here, but if you wouldn't mind sharing, I would love it if you could post about that on the anxiety or panic board. Us panic disorder sufferers don't often see a lot of "healed" folk to get advice from.