I was tested for coeliac disease and the blood test came back negative. My GP told me to start cutting back on gluten and if I felt any better then there was my answer. It worked out to be the answer for both my DS1 and myself . We haven't completely eliminated it, just limited the amount we eat. We have stopped eating bread and pasta. It probably took a week or two to really notice the difference in myself, DS1 I realised after about a week that it was helping.

Good luck