Hey hogi! Don't worry. It's a normal tendency to get depressed and be in the brink of tears even if you can't find a reason of being. Nothing's wrong except your body had quite a day and you were probably very tired without realizing it. It has something to do with oxygen in your brain being cramped because it was preoccupied with a lot. -my theory-. So it's only natural you cried and felt down. Just don't stress too much. And no worries. =)

*HUG* hang in there :)