The best piece of advice I have read about getting things done was written by Frank Tibolt in his book The Touch of Greatness. The rules are simple, only two.
First, write down whatever you that you have to do from the most important to the least. Second, act on it and don't don't stop or move to the next item until you have completed the previous one.
You might want to try this yourself.
Before you call it a day at the office, do a list of things that you have to do tomorrow. Number it and put in on top of your desk before you leave. When you come back to the office the next day, start acting on that list and keep going. Keep at this habit and see the difference that it makes.