Awful periods :-(

So I’ve always had terrible period pain on just the first day, sometimes the second day too but over the course of two years I’ve noticed that they have gotten out of control. I literally sit in the bathtub, with scorching hot water, for hours because heating pads just don’t cut it. Pills don’t work (advil, tylenol, aproxin, ect...) and I get dizzy, nauseous and lose my appetite. 
There’s only one case of endometriosis in my family and my doctor set up an ultrasound to get me tested for an ovarian cyst.
What are is the likelyhood of me having either of those things wrong with me? Opinions? 
(I’m 17 and have had my period since I was 12, if not younger)