Why are you taking iodine?
I have had Hashimoto’s Thyroiditis for 20 years and never took iodine. If you are iodine deficient, you can develop a goiter and become hypothyroid. But you said you had autoimmune thyroiditis. No...
This article from NIH gives a more thorough description of the differences between Type 1 RCD and Type 2 RCD.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2861306/