While it is a fact that gluten intolerance never comes alone, most people will be intolerant to other food as well, it is also helpfull to check other factors such as your environment.
For example, my son is intolerant to fungus on spoiled fruits, so commercial fruit juices (which always include rotten fruits) will make him react.
Some other people, it will be plastics !
Be on the lookout.
Be well
cliniclfortin