I have a bad fever.

You are sick...alot of people are with the weather change. If you are young and healthy, ride it out for a day or two, and more than likely, your own immune system will handle your illness (probably the flu). Take tylenol and keep yourself hydrated. Good luck, and hope you feel better soon. You will, don't worry. :D BTW, if you still have the high fever in a couple of days, it may be related to an infection with your dental work...then I would go to the doctor. They'll need to give you some antibiotics to kill the infection.