Hormones! Venting.

I'm 8+4 today, and for the last 2 weeks I feel so depressed. I feel like nobody even likes me. I have a great support system, my wife is amazing and works hard to provide for us and my parents are great and helpful in any way I need and I have a few great friends that I can call any time.... so why do I feel like this? I keep starting arguments with my wife about things that are just dumb, like asking why she is listening to her ipod and if it's because she can't stand to be around me... just really stupid stuff. I know it's stupid, but my emotions keep telling me that it's true. I can't describe how low I've been feeling. When will these hormones stop or at least ease up a bit? I've never been upset about this kind of thing. If this is what depression feels like I feel really bad for the people who go through this for years.