That sounds like there are more underlying issues there, and maybe the Yaz just exasterbated the situation. B/C pills are known to cause weight gain,or extra bleeding but not symtoms of depression. I am a nurse in ob/gyn and also take Yaz myself and have found it to be the best one I've taken, no weight gain, shorter periods. Everyone is different, but I have also been depressed before and that sounds more like the root of the problem.
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