I'm a sufferer / survivor. I have at least two different triggered modes:
-triggered but still functioning (flight-or-fight readiness, under tight control)
-in full blown panic
I cannot tell you what I am like when I totally panic - I cannot observe myself (or anything else) in that state. My husband might be able to describe (note to myself: that's one more reason to ask him to join the forum).
When I am in the flight-or-fight readiness, I apparently seem very calm and deliberate. I also appear (and feel) very awake / alert. I definitely speak more fully developed and grammatically correct sentences than when I'm relaxed (if I'm speaking English, my accent becomes more Oxbridge/New England-like and much less of my own sort of sloppy drawl). I am hyper-focused on the situation (the problem to solve). I keep an ongoing check on my environment - I actually move my ears, and turn my head, and my eyes swivel - but I do all this very slowly and deliberately, so as not to attract attention to that I am being hyper-vigilant.
The weirdest thing - though quite logical - is that my impulsive, interrupting discussion style vanishes almost completely. I become very aware of who's turn it is to speak, and listen to others with attention. I also take in pretty much all information I hear, see, smell etc. It is as if enough adrenalin cancels out my ADHD and my short/medium term memory problems temporarily - and what I have read about ADHD and brain function, this is exactly as the now dominating scientific theory predicts.
I will make an excuse - almost any excuse, and I do not shy away from lying - to get away from a situation where I feel like this, as soon as possible.
Hope this helps!
Athena