Feeling down

I have a cracked bone in my foot from sparring last Thursday. We were doing paddle kicks in class tonight and I did fine with front and side kicks although I wasn't kicking hard with my injured foot. I did "air" kicks when it came to roundhouses. On one round, my toe barely hit the pad and a pain shot up through my foot.  I don't know what the hell I'm supposed to do for sparring this week. I'm still three classes short. blah