The thing is, I see two different things in the things here (which again is my personal experience). I did in my 20s have a host of problems with my PTSD. The hyperventilation you describe here was one thing. And I got all of those things you mention, and sometimes they would bring on a mild sense of panic.
But the actual "panic attacks" that came out of the blue were in another league. It was overwhelming feeling of panic overtaking for no reason, it put the physical symptoms in the shade as all you felt you were either going to go mad, run out of a shop screaming, just a desire to escape.
The difference between the two were striking and the times when I still hyperventilated much outlasted years the actual "panic attacks"