I knew it! Oh sure, it's frustrating when it goes back to being hypothyroid for a time, but I knew in my heart it couldn't be the iodine's "fault". When something is "off-kilter" for so long, it's going to need time for "tweaking" and adjusting due to the "fine-tuning" the body needs to make to it to adjust to the change.
When you start putting the perfect oil into your car, IT doesn't run perfectly all the time right at the beginning of the change, either!