This happens about twice a year to me (usually around this time of year and again in early spring) just from working. Yelling at a bunch of 2 year olds all day will tend to take a toll on your voice. But I'm not sick! It's hard to work like this cause all the parents are like "are you sick? stay away from my kid" But I'm really not sick - I just have laryngitis. Tea with honey for me tonight!
Re: I have no voice :(
This happens to me at least once a year--and I teach first grade!
In fact, I just had laryngitis over Thanksgiving break. Hope your voice comes back soon :-)