"i was accidentally put on yaz when i was supposed to be on yasmin back in july 2008. i just decided to stick it out and see if there was a difference. the 10 microgram difference in dosage made a huge difference. (yasmin 30 microgram, yaz 20 microgram) from july 2008 to january 2009, (the time i was on yaz) it was completely miserable. i had constant nausea, would feel sick eating anything with lactose, had mood swings that almost cost me my relationship, unbearable headaches and at times i had sharp shooting back pain. i felt completely unmotivated and it had a negative effect on my school life. once i switched back to the 30 microgram dosage, (ocella) the side effects decreased dramatically."