2 things
1) Steve Jobs' commencement speech at Stanford. https://www.youtube.com/watch?v=VHWUCX6osgM
2) Reminding myself of my blessings in life. Most of us have many things to be thankful for, even in our worst moments
Whatever you do, do not seek sympathy from others. It can be very comforting to vent your frustration to people and get their sympathy, but it does absolutely nothing for situation and only enforces your despair.