I just remind myself that this too shall pass. Who cares what happens at work, at the end of the day when you are laying on your death bed, nobody is going to care unless you were President (even then I doubt the family's of former President's were even thinking about that). Just let it go, take some breaths, talk a walk, and calm down enough that you let it go. Think about a happy time or someone you love instead. Then when you go home, leave the problems at work. I treat my job like what it is, a place I am forced to come to in order to get a paycheck. Nothing more nothing less. Nothing that happens here defines me or my life.