That happens to me at times. When things are going amazing, you feel you should be happier... Anywho, things will look up, I'm sure. If they aren't already...
I got an awesome new job myself with benefits also, and then the next thing you know the fun in life is gone, the feeling of suspense that you might break your leg and not be able to pay for it. Now that you have health benefits the suspense is gone.