You are getting way to worked up about this, and it's because you're tired. Being tired always makes things seem ten times worse than they actually are. Take a step back, eat your chocolate bar, and at least attempt to be rational about this, particularly because you did kind of make an ass of yourself there.

Or if you can't be rational about it, call and make an appointment with counselling, because it's what they're there for. But you are _not_ going to let this sit around and become a huge mess. We're through with that, alright?

Love,
Me

PS: Study for that chem midterm!