Why does my tummy hurt?

My tummey hurst bad. It started yesturday and after my shower. I lay down on my side, doesnt help I try to toot/belch doesnt work i try to drink ginger ale nothing. I finally try to drink warm milk and go pottey it did NOTHING!!!!!!!!! HELP!!!! my mom said that i wood be fine. but it hasnt happened yet...help? btw im 12 if that helps.