Experiencing Severe Menstrual Pain - Is It Dysmenorrhea?

Is this what dysmenorrhea feels like? I've always had very, very heavy periods. I'll go through 4 pads during the day, and usually have to get up during the night to change my pad again, even though I use the "9-hour" capacity pads. I've also always had very painful cramps. I can't ever plan anything for the day I get my period (I can usually tell when because I'll dislocate joints a day or two before), and sometimes have to miss uni classes. I'll wake up in the morning and find a little blood when using the restroom, and when the blood really starts to flow, I'll be hit with cramps within a half hour. I'll be doubled over, crying, running back and forth between my heated blanket at my bed and the toilet, trying to get the blood out. Two nights ago, I was forced to stay awake for a whole hour around the 1:30-2:30 hour, running to the bathroom three separate times, writhing in bed, until I finally took ibuprofen, which caused it to settle for a few hours so I could sleep. The cramps only ever happen on the first day though, out of my 7 on average. I've been to the gynecologist before, and there weren't signs of endometriosis when they did an ultrasound, and they said my uterus looked normal before telling me there was nothing to do. So, does this align with your experiences with dysmenorrhea?