Help! PMS is really bad, two week before period!

Girls give me your secrets! I can't deal with these mood swings and crying spells I get. Almost two weeks before my expected period, I even get scared to start my period because of how I start feeling two weeks before. I'm on birth control this is my second month, it's helped a little, but it's still bad. It really affects my life and my relationship. I'm 17, and it's really bad :(