I get stomach aches a lot after i eat. in the summer i was pooping #2 had ultrasound upper endoscopy and colonoscopy all normal. do i have cancer? small hernia and acid. what do you think? thank you?

No, very less likely with the negative work-up; however in medicine, we never say 100%. Your symptom is likely due to reflux, are you taking PPI drug for the acid? Besides med, you need antireflux measures: eat slowly and do not over eat, avoid any food or drink which exacerbate the symptoms, do not lie down within 2 hours after meal and if possible, raise the head of your bed with 2 bricks.