Birth control can sometimes cause weight
gain...but not every woman is the same. I never had
weight gain with Yasmin. Sleepiness is not a
side affect of metformin. And also, not every woman who has PCOS has diabetes. As far has the birth control, it did lighten my period and made it shorter as well. I never had breakthrough bleeding with it. My body reacts to medications very well...I've never had any bad side affects from anything I took.