Now tell me, what did you really think? Did you think the laws of the universe were suspended when you went on your trip? Did you think some magical power would allow you to eat all those "bad" things and nothing would happen? Yes, indeed, it is a lifetime thing. And, yes indeed, you can have treats now and then on vacation, but remember, it's a vacation from being in your usual place, not a vacation from the laws of cause and effect.
You'll drop most of that weight in the first week back if you get on track. Like the other folks have said, it is probably water imbalance.