Heavy flow?

Okay, so this is somethingI have always been worried about. I first started my period when I was 10. The first time it started, I got seriously sick and it lasted for a week. I couldn’t attend any sports cause I just felt awful, luckily it was in the summer.

For years now, I always have to take a day off when I get on my period. Because I just feel so sick but cannot do anything about it. The flow is also really heavy. I’m 13 now, and almost 14. My mom isn’t worried about it but I am, sports help... but the flow is always super heavy. To show my point... once I put in a tampon (cause pads dont work for me) not to mention, it was a large... I can’t go any larger cause it really hurts too. I walked out of the bathroom, and I bled through a couple minutes later. This was only a month ago.

Someone help? I need advise and I don’t think my mom understands how worried I am. Thanks.