Well, I put on 2 lbs. GRR!
My body-builder friend says it's because alcohol makes you retain water, so not to worry, I should "pee it away" in the next day or so. I hope he's right! Am drinking loads of water to help my body start to regulate itself again properly (the more water you drink, the faster you pee it out, and the more ability your body has to process its fat and get rid of it!).
Anyway, I've been good as gold yesterday and today, so it's just a question of wait and see!