I understand your fears totally, had many of these panic attacks in earlier years unfortunatly.
Highways, elevators, long walks with the dog in the woods, avoiding sociaal events..

What I learned is not never ever avoid these challenging circumstances!
I did just that for a long time and thus limiting my life and joy in life..
With help from some pills - not heavy stuff- I started to do these things again.
Costs a lot of accepting the fears and while knowing that the panic can strike again, still do it anyway....
OK not big challenges at first but gradually you pick up your life again.
The thing is to continue doing things that make you panic.
But please... do not close that door..by saying that you wont do that anymore..
Try getting real help, take pills or whatever and keep on going.
I don't want to oversimple your anxiety. Been there, done that believe me. It can really get to you, I know.
But fight it. Take back your life..
My two cents at least.

I wish you well.