I picked depression because it always seems to be there as a 'base', so even if I'm messing around and laughing, I'll still feel depression 'holding me back' or in the background... It's hard to explain.
Sometimes it depends though. If i'm not depressed then I'm usually feeling numb. Occasionally, I am quite an angry person but I wouldn't really say that it was a 'constant' state, but when I am angry then it doesn't tend to subside until a while later.