If I tested negative for STDS, why are my period cramps SO bad?

Anonymous
Keeping this anonymously, I apologize...

Ever since I've received my period, possibly in middle school. They always were awful in a way. Constantly heavy, never really painful. Over time.. I'll say after high school, it just got worse and worse. Last year to this year, my periods would hurt SO BAD.. I'd be scared to eat. My period cramps would cramp up so tightly, I will moan in pain and have to stop what I'm doing.. I'm a wuss on period cramps. But I'm not a wuss whenever it comes to other pains.
I remember my last job, I was getting awful period cramps to the point. I was close to passing out. Though, I didn't eat lunch that day.. Whenever I eat food on my period, it just goes down my digestion very... very... wrong. I ain't giving much detail.

Should I go on a form of birth control? I know I need to see a doctor. I got a STD test recently. Just cause I'm seeing somebody new, and we had sex protectively. I still got tested. Everything came back negative. I'm just really concerned what all this can be.
If I tested negative for STDS, why are my period cramps SO bad?
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