What has helped me in that past is this here: "do nothing alternative"[1]. That is, I select a task that I think is most important to me and set aside a certain time to do it (lets say 2 hours). During that time I either work on that task or I do nothing. So if I don't want to work, fine. All I can do then is stare at the wall.

This has to effects: 1. I calm down. Its kind of an enforced meditation period. 2. I usually get bored and go back to the task.

[1]: http://www.psychologytoday.com/blog/the-happiness-project/20...