That's exactly why I'm still hunting and self diagnosing. My economy is too difficult to try to find lab for testing. My sinuses are still very bad; even after Iodine 5 months and Miracle-Mineral-Supplement 9 months, liver tonic 3 months, adrenal support 3 months. They seem better when my bowels are not sluggish. I'm back to believing that it is thyroid; due to cold/hands/feet, fatigue, constipation, etc. I'll come back over to the Iodine supp. forum after I study your FAQS. Thanks for your concern.