Bad Periods

Elise
Hey everyone!! I'm sixteen and my periods are really really bad. I first got it when I was eleven and for as long as I can remember they've lasted five days to two weeks and are extremely heavy up until the last day or two. I'm also anemic, and since they are so heavy and last so long, I'm extremely dizzy and lightheaded 80% of the time. My cramps are debilitating and at times will come in sharp surges, in which the pain carries down into my legs, making it hard to stand or walk. I'm currently taking a prescription pain medication and just went and got an ultrasound yesterday but won't be getting the results for a few days. Endometriosis runs in my family and I'm really scared I may have it. I'm really big on children and want to be a mom someday, but I know that infertility can also be a result of this, are there any treatments or things I can do while I'm in my teens and early twenties to increase the likelihood hood of having kids in the future? If you ladies have any words of encouragement or advice, please share.