Heavy period problems.

I feel like my period is overly heavy. It's been heavy for a copy of years. I'll use up almost a while box of tampons in one period (36 in one box in super ). I don't understand why its so heavy I eat pretty healthy. I'm also 18 almost 19 if that makes a difference. I take 2-4 Aleve each day for 2 days. Some periods I get bad lower back pain. What's the problem? I have been drink around 100 oz of water a day could that effect it?

Thanks for the help in advance 😄