What I should've done then was drive to the next off-ramp, a few miles north, pull over on a side road, and calm down. As it was, I powered through once I was in traffic, but I was stewing in adrenaline and worry. Took a while to come down from that; I had trouble unwinding once I got home, about 9:30.
I'm only barely out of bed now -- I decided I needed as much relaxation time this morning as I could find. Will it be enough?
Remember, Chris, it's a short trip to work and you can get coffee.