Well I hope that you won't have to stay with 1200 calories for long. In fact, I'd suggest NOT doing it for long...and bumping them back up to 1500 or so. Do you really want to live on 1200 calories for the rest of your life? Sounds depressing to me. And I hear ya...I've had to do that in the past too. One day the motivation failed, and allll that weight I'd lost started coming back on at a remarkable pace. If nothing else, maybe you could have a day or two during the week where you eat considerably more--say 2000 kcal. If your body gets too used to 1200, you're in big trouble.

Congrats on the whoosh.