my son 11 year old having on and off left lower sharp pain in abdomen, states feels like rocks, frequent small bowel movements which gives him short term relieve, burping, nausea, tired, pain hurts when he cough,sneeze,laugh, when touched in that area painful. just got back from er with no help,did kub and found stool in left lower, urine negative, mono negative, but he is still in pain and sent him home with no help, what should i do next?