Most Helpful Guy
Talk about it with close friends, and if that doesn't keep your anxiety down, make an appointment with a professional counselor. Not that they're so much more valuable, but you may need to talk with someone you DON'T know to really get it all out there!
Most Helpful Girl
You continue to think of it as one day at a time. Eventually, you'll wake up and realize you care less today. And then in a few months, that you care even less than that. You may even meet someone who takes your mind off of it completely.
A week is not very long, and it's normal to still be in that phase of making it a game to get yourself through it.