I'm 18 and this is the first time I've ever taken birth control. ...

I'm 18 and this is the first time I've ever taken birth control. I started taking the pill the day my period started. On that day I got extremely dizzy and completely passed out while I was on vacation. After I regained consciousness I was having horrible cramps, the worst I'd EVER had. I was in unbearable pain. I wasn't sure if that was caused by the pill so I decided to continue taking it. My period lasted for 8 days, when my doctor told me that it should have stopped almost immediately after taking the pill. After my period "stopped" I continued to have light bleeding every day. I'm almost on my third week and I started my period again. I am VERY emotional and irritated and getting extremely angry over small things. The side effects of this pill are horrible. I'm pretty sure I'm NOT taking this pill anymore.