so for about the last 5 days, i've been having stomach trouble. at first, the pain was pretty small and didn't bother me all that much. but by the third day, it started to become very un bearable. i can't really pin point where in my stomach it hurts but its sorta in the middle and sorta lower. i took some medicine that day, and it seemed to help. the next day, i went to my grandma, who's a pediatrician, and got tested for strep throat bc my symptoms are always stomach ache and headache, but it came back negative. but today, after i ate ( pizza & 2 brownies) i would say 20 or 30 minutes after, i started to have really bad stomach pains. they were very un bearable and i couldn't ignore them. after a while, i started to feel nauseous and i freaked out ( i have a terrible fear of vomiting) i told my grandma , since i was at her office, and she gave me two tylenol pills. it eased some of the pain, but now (about 3 hours after) my stomach no longer feels painful, but feels uncomfortable and i feel very fatigued. it literally feels like someone just sucked all the energy out of me. also, i keep on feeling like i need to go diarrhea or poop (sorry tmi) but when i go to the bathroom, nothing comes out. i don't feel constipated or backed up. i really wish i knew what was wrong? also, just btw, I'm 14 and i do have ibs, so idk if that could have anything to do with this but anyways, does anybody know what could be wrong with me?