1. Work on things that are important, instead of just easy.
2. Keep an "activity log."
3. Set daily goals. If you must commit to a date, be conservative
4. Be gentle with yourself, don't try to achieve perfection
5. Avoid interruptions.
6. Don't let other people's problems become yours.
7. When you are feeling overwhelmed, say so.
These tips can make your work more manageable, and might even reduce your stress enough to let you go back to drinking double lattes.