Take a good look at your to-do list and identify the thing (or things) on it that is likely to invade your thoughts until you get it done. Formulate a plan for dealing with that task using some of the antiprocrastination tools you now have. Do something right now that changes your productivity environment so you can do a better job of staying on task. Practice a technique for calming your busy mind. Does it work for you? If so, commit to using it regularly.