Pains

Why am i experiencing pain below my belly button , on the left side . I stay away from sodas although i did have a cup full , But thats it . I tend to gravitate towards juice and sometimes water , But im hurting really bad . I think for two days now , I have a cup of ice water im drinking right now , i tried to use the bathroom(not urine, the other thing tmi im sorry) and when i did i had a pain from releasing , Could also be that i was constipated for awhile . Is there anything to fix this pain im experiencing ?