Pain after eating while on period?

I was sleeping and got up to eat lunch at 11. I went back to lay down, and I knew I shouldn't have done that because i felt as though the food I ate wouldn't be digested properly if I was sideways and curled in a ball. I did it anyway because I was tired. I woke up again at 12:40 experiencing the worst pain I have ever felt, far worse than period cramps. It felt like pushing inside of my body along with stabbing. (No I'm not pregnant, I'm a virgin and I have my period lmao) It came in long burst, would slightly go away for a few minutes, then come back again. This went on until 2:30ish. There was one more long pain and it went away after a while and didn't come back since. The only thing that seemed to help the pain was laying on my stomach, but that couldn't even help at times. It's now 3:19 and the pain is very faint. Does anyone know what that was?