What is it about this time of year?

I don't know why.. but every year for as long as I can remember I get obsessive about making everything PERFECT for the holiday and having my family over. When I was younger, before I hurt my knee and I just can't now, I would even get down and scrub the floors with a toothbrush and wash down the basebords because it had to be that clean. For perspective during the rest of the year I could care less about dusting or much of anything cleaning related it's just a chore. And it's not just cleaning but my house suddenly has to be redecorated, anything not new looking I want to replace and I get upset about all the little unfinished projects and lack of anything I had wanted to get for the house, etc.

And now that it's all done and I can relax.. I get depressed. Every year...! WTF is wrong with me?