Urgent need to ask for leave and not go back to school! ! !

You can call in sick and say you can't go back to school in time. If you need a hospital certificate, you can register in the local hospital and ask the doctor to write a certificate for you. You can usually put in a good word for your doctor. As for how long you want to ask for leave, it's up to you. If you want to extend your holiday, you can contact the school and say that you are still sick.