back cramps????

hey guysssss I started my period on Friday night and Saturday morning after breakfast my mid/lower back started cramping TERRIBLY. I felt so nauseous and the pain was making me dizzy, too. I laid on a heating pad and took some Advil and it seemed to go away. This morning I ate some lunch and the same thing happened!!! I'm just wondering if anyone else has this problem. Of course when I google it it says I'm either pregnant or have pancreatitis. so that's why it's freaking me out. I also have pretty bad IBS and Acid Reflux and I have gotten back cramps before after eating but never terribly bad. just wondering if anyone else experienced this ever??