About writing the after effects and signs of Panic Attacks (atleast in my experience)
I do only remember having two, or at least since I stopped trying to act like they were something else.
Everyone has a different experience with the aftermath of them, but I feel in most stories I've read it's almost like the panic attack stops and everything is fine again, and in my experiences it isn't.
Perhaps I also simply notice more things about it, considering that I use sensory to ground myself, but that isn't the point.
I don't want to rant on about useless background information so here are:
A few things I personally think should be talked about more regarding the aftermath or beforehand of having a Panic Attack
Sweat. Something I almost imideatly notice when I snap out of my panic attacks is the uncomfortable feeling of sweat making my clothes practically cling to my body. I don't notice while I'm having the panic attack, considering that obviously I'm not down to earth, however after I will feel like a wet fish on land.
Speaking. Most of the time I've seen so many people write the characters to immediately be able to talk properly again, which in my experience isn't like that. It's most likely a well-known fact that during a panic attack you literally can't speak, even if you tried to force yourself to do so you just for some reason can't, outside for maybe a few muttered words and shaky whispers, and just because a panic attack ends doesn't mean it's immediately fine again. My voice tends to tremble and I can't speak loudly without having to stop mid sentence, it gradually gets better but for me it atleast takes 10 minutes to fully regain my voice.
This is just a personal thing, but I tend to hyperfocus on little details over and over again trying to avoid getting lost in my mind. Panic attacks are scary, you don't want them to happen, which is why you'll most likely over concentrate on grounding, from my own experience it helps little and can be even more stressing. I especially find myself doing this while on the verge of having a panic attack.
Heartbeat. Perhaps this one is very obvious but your heart is RACING. It isn't something people miss, but I wish people would describe the feeling of dread at hearing your heart fasten more and more as you know "I know it's going to happen" more (Ew I used more way to much here) After a panic attack your heart will slowly fade back to being normal, but it doesn't immediately happen.
Triggers. Panic attacks don't always get triggered by big things. Of course this solely depends on the character in the end, but I've had panic attacks over minor things such as backhanded comments about sensitive topics. It was fine, it hurt and then your thoughts start rolling out of control. Oh, you can already feel how it's going to happen, but you're to scared to say anything, because the reason is so minuscule why should it matter? This more a thing about panic attacks that happen due to escalating intrusive thoughts more than anything but most of the time you will try to dismiss the issue, you will feel horrible about everything you do and you know you need help (if this happened before) but you're scared that it was just overreacting.
Of course I'm not a medical professional, and this is more about my own experiences, this is not a rule to writing characters with panic attacks, it's just some personal things that I've experienced that barely get represented or talked about.
Almost no one will experience panic attacks like I do and for the reason I do, because we aren't the same person. Heck, my panic attacks always have differences. Sometimes I might have a lot of messy not even full breaths that you barely hear and other times I will try taking deep breaths that will just choke out due to sobs and are ugly loud.
Feel free to correct me on anything that seems invalidating or wrong