How do I get into the Christmas spirit?

I used to love Christmas, and I loved the whole anticipation and everything; but I always am sad when its over. Now its five days until Christmas and I'm dreading it more than looking forward to it because I know it will be over soon. I know I sound crazy but this have been my favorite time of year forever, and now its just sad. I've built a gingerbread house, decorated the tree, I've even given my friends gifts. Any ideas for what I can do to feel better and more excited?