Broken hand - help!

Hi everyone,

I'm hoping to find some advice and suggestions. Yesterday I was in the Run For Your Lives zombie apocalypse 5K as a Girl Scout zombie, which was amazing, but I broke one of the metatarsals in my left hand. I am currently in a splint but will probably end up in a hard cast after seeing an orthopedist. That may take a few days depending on what Hurricane Sandy does in the DC area and who is closed because of it. I can't get either one wet and I'm afraid the cast will get all smelly if I exercise and sweat in it. Have any of you had the same situation? Did the cast get smelly?