You can’t keep bottling things up, Alec. It’s only a matter of time before they explode. And not the fun kind of explode.
my personal headcanon: stiles's panic attacks get worse after the nogitsune. he calls them "episodes" in his head. because it's no longer just a panic attack (as if it wasn't bad enough). these episodes start with violent flashbacks with seemingly no triggers, then there comes the accompanying panic attack, crying spell, and the cherry-on-top chest-numbing amalgamation of grief-guilt. he doesn't realize (till derek finds him during one) that he's been whimpering "please make it stop". -ace