Really heavy.

So I'm 15 and I've had my period since I was twelve. My mom and I have talked about birth control, (strictly for my horrid cramps and rediculously heavy flow), but she decided not to let me because of our family history of blood clots. Are there any ways you guys know of that I could lighten my flow naturally? I am going through a super plus tampon in about 30-45 minutes and my cramps make me throw up most days.. Help is appreciated!