Well I never have been on birthcontrol so I didn't really know wh...

Well I never have been on birthcontrol so I didn't really know what to think of some of the symptoms. But about 30 minutes after taking my pill I start to feel drastically lethargic, useless, my head feels so heavy that it could fall over, and I feel like I coudl throw up at any moment. I have lost all of my sex drive, which isn't a good thing since I am about to get married. Acne hasn't gotten worse or better, it's still pretty normal. I just feel really week,a dn my head throbs I don't know what to do. I mean if I take pain Killers then it makes my nausea just that much worse. What can I do?