We all face difficult situations from time to time. We're stressed, short on time, pulled in many directions and tired. Who can blame us for being short-tempered?
But realistically, that solves nothing and gains us even less. Try taking a deep breath, look around you and find the humor in the situation. Most of the time there is something to laugh about.
I realize there are situations where this won't work - family illness, death, loss of a job. Then take time to watch some funny movies or silly videos. Ask your friends to share something funny. I promise, it will help a bit. ;)