Making time for yourself and finding healthy ways to deal with stress are important. Some things you can do to help prevent or reduce stress include:
Eating healthy foods
Being active (at least 30 minutes most days of the week is best)
Doing relaxation exercises
Getting enough sleep
Try to figure out what causes you to feel stressed. You may be able to cut out some of these stressors. For example, if driving to work is stressful, try taking the bus or subway. You can take this time to read or listen to music, rather than deal with traffic. For stressors you can't avoid, keeping organized and doing as much as you can ahead of time will help you to feel in control.