I've read this is becoming a more common situation as testing and screening improves. DH thought he didn't have symptoms, but now he can look back and see them. He just didn't realize they were related to gluten.

On the one hand, I'm suppose you don't feel all that "lucky", but it could be seen as a good thing! I've also read that you could start to react after awhile of being gluten free.

I'm not sure how long that will take, it is highly individual. How soon, and what form that reaction takes, is also very individual; but some people can tell within 30 minutes of eating and fatigue is often mentioned.

How quickly you heal up and become vulnerable may also depend on whether you need to avoid other foods such as casein. The enterolab tests can give you some info on that sort of thing or ELISA allergy tests. But the most reliable thing to do is an elimination diet.

You could focus on the most common adult allergens and the most things that tend to bother celiacs the most.

Is a f/up biopsy planned?

Good luck with the new lifestyle and keep us posted on how you are doing!