Google "Pomodoro Technique"--it's a time-management system. I don't follow the whole thing, but I do two things from it.

1- I break my work day into 30 min blocks--25 mins of work, 5 mins of recovery (gentle stretches, bathroom break, mini-meditation, snack). I set schedule of what those blocks will be used for (email, returning phone calls, filing, etc.).

2- Find the "To Do Today" templates & print a bunch. They are broken up into a regular list & room for things that come up & need to be taken care of. If there is a task you need to do every day, enter that in the top part, then USE THEM EVERY DAY.

My first task every day is to review my list from the day before & add anything to the list that I know I need to do. I got out of the habit the last few days & realize I need to start again--my productivity went way up & my feeling of being overwhelmed went way down when I was doing it.It really does help.

Good luck.