Thursday, October 6th is National Depression Screening Day in the U.S. Millions of Americans suffer from depression and don't even know it. We assume we're in a bad mood because of our crappy jobs or lack thereof, or any of a hundred reasons. We assume everyone would feel the same way given our situation.
I find that I'm depressed when I leave the house every day in a bad mood, when everyone irritates me, when I don't look forward to even my favorite things and when all I have to say to my husband in the morning is complaints and criticisms. For a lot of people, this probably sounds like business as usual. If it goes on for months, it's not.
You can check yourself for depression here.