I'm not pregnant. But I do have a bruise like pain above my belly on?

Im currently 20 years old, female, and just started having this bruise like pain right above my belly on.It's been happening for a couple of days, usually after I eat. the only recent vigorous excercise I had done was play an airsoft match for half an hour outside. I know I'm not pregnant because I took a pregnancy test. I have no medical insurance so obviously Im the idiot that should go get some ASAP. I searched for answers on google but there is only answers that have women who are pregnant. My mother has the same stomach pains for about 10 years now, and she took tests that resulted in gall stones and internal bleeding, So now im frikkin worried! if anyone knows anything or had an experience like mine please reply to this! I havent been able to eat or sleep because of this pain, and i have no money to pay for medical right now...unemployed..:( thanks so much