"Just breathe. Breathing seems like the most natural thing in the world. But there are ways to breathe mindfully that help calm our bodies and minds almost instantly. The 4-7-8 breathing technique, known as a “relaxing breath,” is especially effective:
Breathe in quietly through your nose for 4 seconds
Hold the breath for 7 seconds
Exhale forcefully through your mouth with a “whooshing” sound for 8 seconds "
10 Ways to Make a Bad Day Better
"10. PUT THINGS IN PERSPECTIVE
No matter how bad your day is, it's unlikely that these events will alter the course of your life in the long term. Consider this simple but important question: "Will this problem matter to you in one month? In one year? In five years?"
In most cases, the answer to this will be "No!", and this question can really help to put a bad day into perspective."
"The best thing to do at the very end of a difficult day? Get to bed at a decent hour. That means, try not to stay up playing back the day in your head. Oh, and turn off or limit your use of cell phones, computers and tablets for the last hour before bedtime. This may feel like a good distraction at first, but before bed, it will just ruin your quality of sleep."