Check out the book Thyroid Healing. Pretty out there, but a lot of people have improved from his recommendations. Read some of the reviews on any of his three books. He also has a website with a lot of helpful info as well as an instagram where he posts stories others have sent to him.
Medical Medium Thyroid Healing: The Truth behind Hashimoto's, Graves', Insomnia, Hypothyroidism, Thyroid Nodules & Epstein-Barr https://www.amazon.com/dp/1401948367/ref=cm_sw_r_cp_api_i_nLapFbFHYHV0K