Steve,
1200 is the ideal amount of calories for a woman to cut back to for dieting purposes. It's common knowledge and supported by most doctors and medical websites and fitness guru's.
Smiley,
It sounds like your body very likely went into starvation mode. You should check out these two articles. LOL. I'm addicted to this site for info. It's 100% legit but you can figure out how many calories you should be getting a day, how to jump start your metabolism so you start losing weight and seeing results, as well as some other helpful tips.
I hope this all helps. Good Luck!