"if i could give negative ratings i would. i have been on yaz for 4 months now and started it as a means of tracking my periods, which were irregular before. much to my dismay yaz didn&#039;t help in this respect at all, i can&#039;t depend on it at all. my periods are still irregular. i have also experienced extreme mood swings, crying over nothing, getting depressed over silly things that never used to effect me at all. i have now stopped taking yaz and i&#039;m so much happier."