So I have a Low Thyroid does that mean I have Hashimoto's Thyroiditis? All I was told when I kept gaining weight and was told to eat less when I wasn't a big eater and then they Finally did a thyroid test after a year was that my thyroid was not even in the range at all. So they put me on meds. I have no clue but being my age, and had fillings like you have wondering if I do!