College students have to ask for leave, and some schools need parents to call for leave. Some schools can apply directly to counselors, but those who are sick need a hospital certificate.
It's difficult to ask for leave from college. You don't need your parents to call the school, but you should contact your parents and let them know what you are going to do. Generally speaking, it is ok to ask counselors to take time off without affecting the course arrangement, but if it affects the course of one week, it is probably impossible to take time off, especially for some young counselors, who are afraid that they will be responsible for their own problems and will not let you go out of the province.