Hi, I am a 47 yr old woman of interracial origins (African/Canadian) I was diagnosed with cancer of the Thyroid Gland two years ago and underwent compete Thyroidectomy, as well as radioactive iodine therapy. My most recent blood test results indicated Anti-Thyroglobuline at -20 and Thyroglobuline at -0.5. The word "Low" was written next to the Thyroglobuline results. I have been feeling particularly fatigued recently, experienced exceptionally heavy menstrual flow two months ago, and was wondering if these symptoms have anything to do with the test results. lf so, what are the other possible symptoms that may be causing these results?