What is happening in my body!!!!

So I am the pill (for period regulation) but even before that this started Happening when I first got my period at 12 they were normal they were kinda light actually but about 8 months later I notice them get heavier I thought nothing of it I didn’t think getting my period was that bad I had no cramps at this point. But about 2 months later I started get this terible cramps I couldn’t walk or do anything. When I turned 13 they got really heavy and the cramps got worse I didn’t feel like eating or getting out of bed and they would last through my whole cycle. I would get this side cramps before my period that were just horrible. When I turned 14 I got on the pill the pill where you only get your period every three months thinking it would help. But I just got my period and it is horrible the cramps are terrible my back hurts it’s heavy even though the birth control is suppose to help with that. Idk what to do or who to go to my mom says it fine my mom had endometriosis is possible that I have it.