[attilagyongyosi]

Other comments cover it well, all highly recommended ways to deal with a bad day I think.

What I would personally do is sit down and clear my mind for 10 or 20 minutes. Meditate, breathe slowly and deeply. Let your thoughts race and get out of your mind. Think of all the things you have achieved, all the great people in your life. Let that remind you that it is "just" a lost deal.

Then, go out and drink a few with the guys.