I don't suffer from panic attacks, but I wanted to mention that I have found that splashing cold water on my face seems to have a very "wake up / reset" effect.

I don't suffer from panic attacks, but I wanted to mention that I have found that splashing cold water on my face seems to have a very "wake up / reset" effect. I get a pool of cold water in my hands, lean over the sink, and kind of face-plant in the pool. (A quick cold shower works even better, but is more involved.) YMMV, HTH!