Just had one an hour ago. It happened after an especially distressing business meeting.

It happened while I was driving and I was going thru all the worst case scenarios in my head - then boom. Dizziness, trouble breathing, can't focus, palpitations, tingling and numbness.

Then I started breathing very deeply and it went away. But it would come back (I was at the mall of all places).

I couldn't stay put so I'd walk around (I suppose that's my flight response). Every time I'd stay put I feel "walls closing in" and all that.

Then I tried counting (just mouthing the numbers), just straight counting and it somehow worked. Talking also helped.

Now I'm back to normal. Was a while since I felt that.