Sit down in a calm environment and write down all of the tasks that you need to accomplish. Writing down everything will serve as a visual aid and is much more useful than just thinking about it because it will let you focus on the entire picture at once. This way you will be able to decide which tasks are not that important and can be removed from your daily routine or taken up by someone else. Having less things to do will make you feel less stressed and more in control of your life.