Why Does One Have Severe Period Pains?

I have woke this morning with severe period pains, however i am nowhere near due on and somehow feel as if it isn't related to my period. I have slight lower back pain, but no pain urinating and nor am i urinating any more frequently. I feel slightly nauseous but feel that is related to the pain. The only thing different i have eaten in the last 24 hours was a spicy chicken wrap, i hardly ever eat spicy foods and am wondering if this is related?

No possibility of pregnancy.