Keep your chin up. It's hard to deal with life's problems when you're crying and whining about your rough break. Don't get me wrong- if you need to let off some emotional steam, do what you got to do. If you keep that stuff bottled up inside, it'll wreck you. But when you're finished, stand back up and remember that somewhere in the world, there's a lot of poor saps that have it worse off than you do.
Look for the hidden opportunity in the crisis. Lost your job? You probably didn't love what you were doing anyway. Take a couple of days to spend time with your family before you hit the bricks looking for another one. Wife left you? Great, now you can do all of the things she wouldn't let you do before, and you'll never have to mow the lawn again!
Make a plan, then put it into action. Resist the temptation to jump into high gear and take action without thinking things through first. That will lead to wasted time and energy. Settle on one specific course of action, and most importantly, FOLLOW THROUGH!