Hey. I'm 20 and I've had my period since I was 13. And all through high-school my period was very easy and I was always able to tell when it was going to come within an hour. It was nice. All of that changed as soon as I went to college. They got hard with terrible cramps. I get nauseous and my boobs hurt for a week before sometimes more. I sometimes taste blood in my mouth. I now feel like I can't get out of bed. My lower back will hurt. I never know when they are coming. Sometimes they are 35 to 40 days apart. Other times only 20. Sometimes they last for a week others only 3 days. What could have changed?