Laura,
Another aspect of the thyroid issue/possible correlation, is the incidence of a parathyroid adenoma occurring. When I had my thyroid removed due to cancer in one of several nodules I had had for several years, the Dr found an enlarged parathyroid on the same side. I was not even aware of what the parathyroid was ,, we each have 4 , two on each side of neck behind thyroid gland that are unrelated to thyroid but related to calcium levels in body..(I am not the Dr here,, just what I remember him telling me). upon research for AN I found on the Mayo Clinic website under "risk factors" a history of parathyroid adenoma, a benign tumor of the neck...... interesting even though it did not mention the thyroid cancer or thyroid itself.. it is very close in proximity to it.. also, both the cancer and the parathyroid tumor were on the same side of neck as AN was in my head!! Hmmmmm.............
Just food for thought here,, have a great Holidays..