Wheat intolerance maybe

Patient: My son and I had a bad virus (10 weeks) We both have had stomach pains and son had sickness and mucous. I cut out dairy and its improved a lot-bt still have stomach pains. Son and me had igg tests and celiac-all my test came back neg but sons came back positive for Celiac. I still feel rubbish-stomach puffs up when have bread or fish fingers or cake. Ok after rice flour though and very smelly wind also when have dairy-could my tests have been wrong?