This happens to me. When I have a large weight loss my body is only willing to lose so much weight at a time. Also, I tend not to lose much weight if I don't sleep well, if I'm sick or I take too many medications, even when I strictly follow a program. And one weird thing: I will never lose weight eating stir fries. Every body is different. When my Mom and I eat the same foods, same quantities, one if us will lose weight while the other one gains. I hope you're feeling better!