Thanks. Just curious is there some reason you need to "prove" it? It sounds like your body has given you all the proof you need. You could look into Enterolab if you really need the piece of paper with a positive test result. They do not diagnose celiac, they only tell you if you are gluten intolerant based on stool samples and they do genetic testing too I think. It's expensive however and insurance usually doesn't cover it.
You're welcome. I am having to prove it for medical reasons that are personal.