I would shit myself. I would also shit myself about the box of spiders. Fuck that noooooise.... By the way don't worry about people telling you to get over it. We all have fears and they'd probably shit their knickers in your position too.
I was in a car accident in the rain once, it was very serious and scared the shit out of me. I ended up on the shoulder and took the hit in the back quarter panel so I wasn't hurt. I still can't drive in heavy downpours to this day
To make it worse, my car was totaled and I was very sad because I loved that car. It was my own fault, though. I should've replaced all four tires instead of just the front two. I would not have hydroplaned if I had done that.
I'm scared shitless that I'll hydroplane or something when I'm driving when it's wet. It's the only time I don't go pretty fast (I once blew into a turn perfectly at 45 mph, my mom damn near had a heart attack ).