Sometimes it feels this way, doesn't it. I always find it hardest to face work on the night before; once i am there I am so busy that it all just rolls along and there isn't much time to think about how I'm feeling. In that way work can be a blessing.
Like Rainbowzz said, you've done it before, so you know you can do it again. I know, sometimes it doesn't feel that way, but remember feelings are not always facts. They are important, but they may not reflect how things really are.

I hope you all find the things you are missing soon.