Normally I don't have issues driving around town or under 20 minutes on a stretch of highway or freeway.
More than 20 minutes I usually zone out and a panic attack will come on during a boring drive. I think the panic attack gets triggered by the zoning out or something.
Anyway, I hardly drive for long distances for that reason, but today I helped out a friend in the next large town over from here, it was about a 30 minute drive on a long stretch of freeway and I did just fine.
I did feel tired and a couple of times started to feel like I was zoning out but I talked to to myself and asked the panic attack to come, which of course it didn't!
As long as I'm not too tired, I am confident that I can now drive long distances on boring highways without worrying about having a panic attack.