I severely twisted my right ankle years ago and they gave me walking boot. I hated that thing!! But I hated crutches more.
I drove with my left foot for the gas and brake. Luckily I had practiced using my left foot on the brake because I had a car before that would die if I didn't keep my left foot on the brake and my right foot on the gas while at a stop sign/light. So I learned how to use the left foot. I even sat with my right foot up on the dash. I'm sure it looked very funny, but it worked for me.

Well, I hope you didn't break anything. With it heating up the way it is that wouldn't be fun to have a cast.