Remember that awesome vacation you had (probably years ago), it can help you through today's stressful moments.... Just close your eyes and picture yourself back on that vacation. Walk the beach, ride a horse, or anything that was a fantastic moment during a past vacation. Spend a few minutes in this mini vacation visualization exercise. When you open your eyes you'll find you are more relaxed and less stressed than you had been a few minutes before.
If you haven't had a really great vacation that you can use, borrow one from someone you know - or make one up.