I have a 12 y.o. son who over the last few months has been suffering abdominal pain (left & right), weight loss, red blood cell count below normal, fatigue and nausea. For a long time he has had mainly constipation with occasional loose motions and chest pains. He has a gall stone removed September and a gastroscopy & colonoscopy recently. The gastro expected to find Crohns Disease but didn't see evidence. Any help would be much appreciated.