okay , so since Friday , my stomach has been hurting on and off . on Friday , i had drank a venti frap from starbucks and my stomach started to hurt really bad but then i took a tums and it went away . but right after that , i started having bad cramps (my period ended on Wednesday btw) and i took iIbuprofen and it took a while for it to go away . but then on Saturday , it started up again , but it went away but came back and went away and etc . and it's doing it today too . what's going on ?