"... a panic attack?" Oh, boy. Well, this might help, if he knows what the fuck she's talking about.

"Uh. You know that feeling, when suddenly in your chest it's just tight, like someone's squeezing you but in a bad way? And your heart is pounding, and it's hard to breathe? You kinda feel like you might die, even if you know you're just like--sitting, or on the floor? That's a panic attack."

At least for her.