Menstrual cramps were so bad today I vomited? Is this unusual?

This morning, I was feeling extremely light-heading and was experiencing EXCRUCIATING pain; I could clearly feel the contractions. It took some trouble for me to walk to the bathroom from class. I did my business and I still didn't feel too good. I bent over the sink and I instantly threw up all my breakfast.Yesterday was my first day and my cramps were already quite painful, but it was tolerable. I did cardio for 30 minutes... i thought that exercise would get rid of it, but I felt nauseous halfway and it actually made it worse. I just took an Ibuprofen and I'm already feeling extremely light-headed again (I'm finding it hard to type). I feel my cramps coming back.