I don't know what panic attacks look like for others, but I know they are scary as hell for me. I hyperventilate, lose feel of first my fingers and then feet so that I cannot stand up. My face tingles, like it was waking up from being numb without it having been numb. And the only way out of it is to find a way to calm down. Hugging a pillow helps. Being angry at people close to me doesn't. But blaming some of the uncontrollable emotion on others feels like a plausible explanation, until it happens enough to realize it is something where my mind just plays tricks on me.
The trigger to my anxiety seems right now seems to be conferences, particularly large ones with lots of people I don't know or things not flowing as I imagined. The first one I remember I got from the very first developer conference I ever volunteered to speak at. For the last two years, panic attacks have been a frequent companion to every developer conference, but lately also creeping into testing conferences.
Conferences are too rough on me, so I will be taking a break. Not only because I can't deal with my mind, but also because my presence is needed at home.
I used to be afraid of public speaking, and I trained myself out of it by taking a job that required regular speaking: teaching at university. I still remember what drove me into starting the practice: physically not being able to stand in front of a crowd just to introduce myself. It was crippling.
The panic attacks are more frightening, but also feel harder to control than the good-old fear of public speaking. Over time, I'll figure out a way of working this out. Time teaches things we can't expect or see. It always has.