Rythm, learn from this day. IT REALLY sounds like you are about to get your period. You are moody and tearful, and little problems seem big, you put on water weight, and have the munchies. In the long run, reacting to the munchies will harm your weight loss efforts but for today, it is a learning experience. You will need to find out what you need to do to help with this time of month so you don't sabotage yourself, but that job is for next week when this is a bad memory.
Most women have been there, and we are all here for you. This too shall pass.