I've only had one panic attack in my life and it was out of nowhere as well. I was riding the subway and suddenly I had this urge to run away, as if I was late

I've only had one panic attack in my life and it was out of nowhere as well. I was riding the subway and suddenly I had this urge to run away, as if I was late for something but didn't know what. I got out of the subway and just collapsed in the platform, unable to breathe, shaking uncontrollably. It was terrifying. Reading about the "long fuse" makes a lot of sense to me. I avoid confronting other people and always try to be the "team player" and I guess I just snapped that one time.