Weird effects of birth control?

I'm fifteen and i was on Yaz for two months to regulate my period. When I was on it though, i gained a lot of weight and my apetite increased a lot. It also made me feel physically sick and not myself; I haven't been sleeping well either. I stopped taking it over a month ago and I still haven't gone comepletely back to normal, and I haven't had a period since. i've been spotting occaisionally, and had some weird stuff goin on down there...uhmm help?