I am 44 and have been prescribed Yasmin to help with what they be...

I am 44 and have been prescribed Yasmin to help with what they believe is endmitriosis. I have only been taking it for 10 days, and am not sure if I am sick or this is from the medication. I have swollen an very painful breasts, I am nauseous and gassy, I am listless and have no energy at all, I feel tired all the time! I am also very crabby and irritable. I used to get this way when I was PMSing, but this seems a little early for that, and I was told the Yasmin would eliminate those symptoms. What do you think? Yasmin or some sort of GI bug?