I have a 3-year-old son recently diagnosed with Celiac disease. This had a sudden onset and prior to diagnosis, he was extremely healthy. He has been GF for 2 months now and doing well; however, anytime he accidently eats gluten, he suffers from SEVERE abdominal pain, vomiting, loss of appetite, lethargy for 3 days after. Just wondering if anyone suffers from the same type of debilitating pain as he does after eating gluten. Is this common with Celiac?