Plan something special for the next three-day weekend--something that has absolutely nothing to do with teaching. Completely forget about teaching during that time; don't even allow yourself to think about it. Sometimes you just need to give yourself some time to mentally relax and recharge.

Ultimately, the best way to keep the stress level down and the interest level high is to remember why you decided to become a teacher. All you need to do is look around your classroom and realize that you're helping shape the future of your students, your community, and society as a whole. It's an awesome responsibility, but you're up to the challenge.