What to do when your voice is broken
The first thing to do when your voice is broken is to have enough rest by sleeping at least for 4-5hrs stretch to relax the muscles in your voice.
Many times people try to do practical means by taking mentol sweets to cool the voice but this technique only damages the voice more.
The first step to reviving your voice is to take enough rest, this helps to soothene your muscles in your voice bulb and give it a more relaxing atmosphere.
The reason why it is important to take enough rest is because while awake your brain is active and basically you would have to do some talking one way or the other but when asleep there is a very high chance that your brain is taking a nap too, so automatically your voice in turn takes a nap too.