I was diagnosed with Hashi's nearly 3 years ago......not a whole lot of fun. Basically the body attacks the thyroid gland, plain and simple, but sometimes it can be hard to adjust the thyroid medicine, so be prepared to be tested a lot. I'm in the hospital so much for bloodwork,the staff knows me by now. Consider joining an online group called Stop the thyroid madness. Just google it, request the join the group,and they should be able to help you with any questions. Not sure if anyone in the group has Celiac; I no longer am in the group as I don't find them helpful anymore.