hi, my 7 year old son has been having blood in his stool , not all the time but I can say about 60% of the time. The blood is fresh red, at first I thought it could be bc of a tear, but he complains from stomachache almost couple of times a week, today he called from school needed to be picked up bc he was in sever pain. He felt better after a short while and eating something. A few hours he had a bowel movement and again fresh red blood mixed or swirled with his poop. He got his stool tested about a year ago at his physical and all result came back normal. Please advise....