> Panic attacks throw about 50 different symptoms (you have to have a few before you see them all) of which any one of them would feel like an acute, life-threatening crisis to a sane person. Almost everyone who has a true panic attack will end up in the ER, the first time. You have to cycle through all of the bizarre symptoms a few times before you realize that the attacks aren't dangerous. Once you've learned this, they're just annoying ("shit, there goes the next 10 minutes") but the first few attacks are devastating because they feel real.
I've never suffered from a panic attack, but my wife does, and regularly. This describes our situation almost exactly. The symptoms are diverse enough to be congruent with everything from acid reflux to a full blown heart attack.
The attacks are milder now primarily because she started timing them and now knows going into one that they'll be over in ten to twenty minutes. Not knowing that leads to the spiral of despair, where you become more and more anxious because you don't know how this panic attack is going to end.