Learn to do this and you can even build an empire.
For all the courage and naval strength of the British empire during its heyday, it was the mastery of this tactic that held it together.
Breakdown your tasks into small manageable portions and then complete it. You have a paper to write then tasks may be:
1. Jotting down the ideas
2. Organizing the ideas
3. Connecting the ideas
Also you must set an acceptable time limit to each task. Don't take more time than required to complete a task. Take only short breaks between tasks. Try completing before the scheduled date.
This is a way to beat feeling overwhelmed by work.