Dude it happens to alot of people, I accidently messed a couple of weeks ago (probably from a lack of sleep and too much chilly), although thankfully I was diapered ^.^
And about the stress thing, what relaxes me is reminding myself that we are all just overly conscience animals with to much time on our hands stuck on a giant rock floating in empty space. When I think of that I relize that everything is utterly meaningless, its only that we collectively discided to give meaningless things a meaning.