Do you know of anything that can be done to stop a cough or sneeze while you are singing? That is, when you feel a cough or sneeze coming on and you are performing, is there something physical you can do to prevent it, or minimize it from impacting your performance?

Good question! I'm not sure... Maybe some else has experience with this. If I've ever had to cough or sneeze, I'd just turn my head away from the microphone so it's not audible!