it's supposed to slow down, the surge of adrenaline leaves and slowly, the body returns to rest.
but sometimes, when you do something so scary, so foreign, so unlike anything you've ever done before, the beat of your heart doesn't stop, can't stop, won't stop, won't let you sleep, won't let you eat, won't let you slow down, won't let you move, just sit there, listening to the rampaging rhythmic thudding of your heart as it threatens to leap from your chest, and run out of the room screaming, and you can't stop it.
and you're not sure if you should want it to stop or not.