Sufficient iodine is necessary for the production of thyroid hormones, and iodine deficiency is quite common: bbc.co.uk/news/health-13034582
Can't hurt to take an iodine supplement to see if it helps. Everyone needs at least 150 mcg/day. Three times that is a decent dose, and you could double that (to 900 mcg) without risk of overdosing.
I think you should discuss your symtoms with GP don't worry too much if that was just one recording, but I think you need to talk to GP let him / her know wht yo are suffering at the moment, eat warm foods, lots of hot drinks, wear several layers light weight clothes better than one thick jumper. Hope this hepls
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