Interruptions and unexpected issues are a part of life, and if you have a hard time keeping yourself focused, an endless vicious circle of unfinished business could start bringing a sensation of chaos in to your life. And this is not motivational at all. On the contrary, it is an energy drainer because at the end of the day you will know that you did what you could, but not what you wanted.
If somebody told you that you need to bring down a table in 3 minutes what tool would you choose: a blowtorch or a laser gun? With the blowtorch what is going to happen is that the table will be heated and smudged, and maybe will start burning. On the other hand with the laser gun, all the energy and power will be concentrated at a single point, and the objective may be achieved in less time.
The same thing happens with your attention. If you are focus from the beginning to the end in a task; you will be more effective. If suddenly you remember something that is urgent, or you need to put out a fire, either finish what you are doing or write it down, instead of jumping onto the next task. Keeping track with a task list could be very useful, and will give you the sense of accomplishment every time you put a check next to the task.
Laser power can do wonders just by avoiding fragmentation. The more rushed you are, the slower you need to act. Remember that if you want to spend less time doing something, get it right the first time.