Testing for the anti-gliadin antibodies is only 60 % effective. whereas the biopsy is for sure. Even if you do not have celiac's then gluten is still a very common allergen and you should consider reducing allergenic foods because people are finding more and more that allergies/intolerances have a huge role to play in mental health. I'm not saying go gluten free. but I think that finding a way of eliminating your hidden allergies would go a long way to improving your mental health.