Period help!!

I got my period yesterday, my flow was pretty normal .. Nothing crazy.
Today it is very heavy and I have terrible cramps!  (9 on a scale of 1-10)
I have school tomorrow and I don't want to be on a heavy flow with excruciating cramps, risk leaking or running to the bathroom 24/7..
Please tell me there's something I can do!? 
Anything to make my flow lighter & cramps stop before then?