Thanks for the explanation, D. It's true I'm not living in the U.S., but I have U.S. insurance and my doctor, who is an Osteopath, is there. I'll ask her about nutrient testing when I visit at Christmas. She doesn't have a deep knowledge of Celiac, but to her credit she is the one who suspected and tested for Celiac when I thought that was the least likely explanation for my issues, and she has always been very receptive to my requests for bloodwork tests, etc. I can ask her about nutrient testing and if she thinks I need enzymes when I see her next. It's just a shame that won't be for another few months yet.
Well done for taking matters into your own hands, getting the tests, and figuring out the best route of healing for you.