Hey.
I realize it's an old thread, but I guess people go through these threads anyway - without replying.
I hate long drives, I get really anxious - especially if I'm driving to a place I've never been before.
I usually just hold this thought in my head while driving:
"Ok, so if I start feeling panicky, I can always just pull over, sit down with the door open, and let the panic pass"
That keeps me pretty calm, as I know that the attacks always go away anyway, it's just a matter of minutes.