What you should do, is have someone give you a nice warm oil massage all over your back, and lower back. that'll help you relax and help your cramps and shit. Thats what I do to my sisters when they're really in pain.
And if a girl asks me, ill do it too. Im not cheap though... oh and to answer your question, you're just over pms'ing.... chillax and you'll be straight. Ok, slut..