I’m curious to hear how things went in the ultrasound, I’ve just in the last month been told I’ve got a low grade goiter and my labwork came back indicating possibility of Hashimoto’s (and incredibly low iron stores, but I don’t know if those are related). My natropath is titering me up on iodine drops along with miscellaneous other things but we have to keep things mild since I’m pregnant.
As for the move being stressful, even if it was a relief, it seems very reasonable that your body could have taken it as stressful enough to trigger a significant stress response. Even in the best conditions a local move is stressful, let alone transatlantic!