My husband always shows a gain after a drinking weekend. He typically feels bloated, so its probably a combination of water weight and, depending on what you drank, all the added extra calories. But I really think a lot of it is probably more on the water retention side. Don't lose hope! Everyone goes in and out of motivation. Just the fact that you posted to the site shows that you are still in it! Don't throw in the towel! I'm an emotional eater, and I probably would be thrown into an eating frenzy if my scale did that to me. BUT….today is a new day! Hang in there! =)