I have frequent anxiety attacks myself.
It can be a bit hard to explain to people who don't go through the same thing, but in short, it's fear. Pure unadulterated fear.
It's what I imagine drowning would be like. That same panic, that same sense of urgency.
또는 like... you're about to be robbed, 또는 drive your car head on into a tree. That same gut-wrenching, overwhelming fear.
Like... take anything you've ever been anxious 또는 nervous about, but amplify that dozens of times over, and prolong the feeling.
It's like 당신 think whatever problem you're facing is going to kill you. Not to say that during an anxiety attack 당신 actually think the thing you're worried about it going to kill you, but it's that same sort of fear.
There's a lot to it, and I'm probably not explaining it very well, but in essence it's an extreme, uncontrollable fear that takes over 당신 and stops 당신 from functioning.
I don't know what's going through her head, because I imagine that it's different for everyone that experiences it. For me, it's like constant noise, and I'm thinking thousands of things at once, but all of those thoughts are screaming at me and I have to pay attention to every single one of them. It's like one giant, internalised scream that I can't let out. (It looks and sounds quite a bit like
link for me, to be honest, particularly midway through it and at the end) It's like I'm the sole soldier against an army of terrible dragons, but those 용 are invincible and I'm screwed, and even the most reasonable things get twisted into knots and contribute to it. It's like nothing but my fear is real... like maybe I'm not real, too. And all I want to do is run away, go somwhere else and just stop. But 당신 can't run away, because 당신 can't escape yourself. (this is just me, though, it might not be the same for everyone)
It usually gets better when I cry, 또는 if I talk about it with someone, 또는 if I get pissed off and scream enough, 또는 if I'm alone for a while depending on the situation at hand.
But it could be totally different for her, though the idea of an entirely helpless feeling is pretty much universal to my understanding.
I don't know how she copes with it, but if leaving the room and walking around is her way of coping it, that's what she needs to do, and it's best to let her do it. If she needs to talk, let her talk- listen, and don't interupt If she doesn't want to talk about it, don't make her.
Honestly, it boils down to her own coping mechanisms.
Just realise that she's fighting a monster that can't really be fought, and in that moment she's entirely within her own head.
TLDR; It's confusion. It's fear. It's helplessness. It's pain. 당신 can't breathe, and you're entirely helpless to it. The best thing to do is let her cope on her own unless she asks 당신 otherwise.