I have been on Yaz for almost 3 months, and have had reverse side effects. They said that it will help with PMS, Acne, and shorter periods. NONE of these things are true. PMS: I have been crying on the drop of a dime. I am barely ever in a good mood anymore, and people are starting to say things to me at work. I am MISERABLE. I am irritated easily, VERY paranoid, with no reason to be, and am picking fights with everyone, again, with no reason. It is driving my boyfriend crazy. ACNE: I had pimples here and there before I started this birth control, but now it has gotten VERY bad. It is all over my face and I feel helpless. Shorter Periods? Yeah right! Before I started Yaz, I had periods lasting for at most 4 days. My periods since Yaz have been up to 7 days! AND they start early...I have 2 pills left and I just got my period today. I am getting off this pill IMMEDIATELY, I am going to try Lo-Estrin next, hopefully it'll work better than Yaz!