I think I have a stomach ache right now and I really don't know why. I'm on my period; my second day now and I just got done doing eighty crunches about three hours ago. Could this be why it hurts? I haven't over eaten today. Last I ate was at five 'o clock. I remember growing up I'd get a stomach ache and I'd whine and ask my mom if I would vomit and she always said, "Oh. You probably will. No big deal." So now I always think that I will vomit from a stomach ache. I'm so scared. What is wrong with me?