You're sad because you're sad. Analyzing the sadness keeps it around. You want to get up and get out and go do something you've never done before. If that's too much right now, get up and do something. Iron a shirt. Make pancakes from scratch. I don't know. Something, anything that is different, that results in a change in something. You made your shirt free of wrinkles, you made pancakes. It will give you enough of a slight energy boost to get out and expand your world a little bit.. go to the bookstore and wander about. Go to a park and take pictures in a creative way, or better yet, find an event where there are lots of people and take pictures of your surroundings. Then come home and edit them.
Movement, results, action, creativity.. Patience, no expectations of big quantum changes. But no dwelling. Now is the time for forward momentum.