new cramp feeling

I'm 16 and my periods have always been really bad. my cramps usually feel like a sharp pain and they only last for 30 seconds, but my last period was really different. I had longer cramps but instead of a sharp pain I felt extremely nauseous and I would throw up a lot. I never have had this problem before? Is there something anyone knows on why my cramps changed or any tips on how to sooth them?