I have been on Yaz for 3 days now and stopping it! I have been on Yasmin previously which never had any problems, just the slight weight gain, predominantly water retention, so this time, a year later, was prescribed Yaz. Immediately I felt very sensitive and down, could have broken into tears over the simplest things and also an increase in appetite. The worst though, as I have never experienced before, very lethargic and interrupted sleep, slight fever, bad nausea though not throwing up, cramping and bloatedness, having period like symptoms. Now reading this page on Yaz, I wish I never had thought to change or experiment with this and would not recommend it.