I wouldnt worry about this. Iodine in some cases worsen a hypo thyroid, but this is a transient phase.
Selenium may be important while taking iodine, but keep in mind that none of the VWT supplemented with selenium the first year(s)without any damage.
I was cold to the bone while hypo T, what helped was iodine, loads of it.
Hashimotos is an autoimmune disease, taking Iodine does not cause Hashimotos!!, (but for some that already has it, taking Iodine may be challenging in the beginning)