I have a big problem pls help me!!!?

Been not sleeping much lately since I was busy with school work and also I had the village feast. I am a singer been singing for the last 9 years, this week my voice didn't woke up at all..and I am findinig it hard to sing the high notes, I am really good at singing a pro..before I used to make them perfectly but from a week till today I have a sleepy voice...What can I do to have my voice back?