Hi, and sorry you are having some trouble. I also have auto immune problems and thyroid nodes (lots of them). I have objected to more bite wings and especially CT scan. My dentist respected my wishes. I have had too many MRI's and CT scans for spinal fusions. I am very careful about what I allow now. You have every right to question. Talk you your PCP about this before you go to your dentist if you can. He may have more to say about the CT scans etc. I wish you all the best. ginnie