I do.
Which makes me even more aware that I need concentrate harder on the good and positive. Because even in one of those days, there is something to be learned, and gained. Whether it be lessons, or remembering to be thankful for what has gone right and is currently going well in your life. Sometimes, it's a struggle, but I do it anyway. It helps to know that, even in my most sucky days, there are about a million people who have so much more suck in their lives, they would happily trade lives.
Chin up man, the level of the suck, depends on you.