My son has been dealing with intestinal pain for 4 or more years now. The doctors have done MRI s, colonoscopy and other tests but with no answers. He has lost weight because it seems whatever he eats doesn t agree with him. He is constipated more, but occasionally has diarehea (spelling? sorry). He hasn t eaten for 2 days now, gets the chills and always feels like he has a knot in his gut. What do you think he should do? He has been tested for crohns, celiac, etc.