Cramping, like, all the time

So I have a kind of normal period. I was extremely anorexic in middle school, and my periods just kinda stopped. It's been 3 years since then, and they are some what normal again. However, my last cycle was a whopping 48 days and I had been having cramps the entire time. I had my period about two weeks ago, and I am still cramping. I'm sure some of this could be from ovulation; however, I'm a little scared I could have a cyst. What should I do? I'm not on the pill or sexually active.