I've been having the same problems with yaz and I'm thinking of going back to ortho-tricyclen because I never had any problems with it. I also end up having a longer period on yaz even though it's supposed to give you a "3 day period." I'm not sure about the progestin levels, but since so many women are on ortho-tricyclen I assume that it's one of the best out there, and from personal experience I'd say that it's much better than yaz.