I have heard if you drink lemondaid that helps to stop/slow down a menstrul flow...
Ibuprofen can help slow things down a bit - start taking it today and through the day tomorrow, and be sure to drink plenty of water.
I also like the OB brand of tampons - I never go above the "Super" size of them, but they make all the way up to "Ultra" if you need help keeping things under control.