I was "minding my own business" today and out of thee blue.. a panic attack strikes.. I'm driving.. feel like I'm dying.. can't breathe.. pulled over.. but it just came out of the blue,

why would that happen?

I have many panic attacks, alot are in my sleep - triggered by some nightmare that I'm having.. then I wake up in a full blown attack..

But this one "hit me like a ton of bricks"