I have hair loss too, mainly from fringe area and top of scalp although side are thinning too. Seems I have lost around one third of my hair and you can see my scalp in several places. Also have chunks missing from eyebrows too, recently had thyroid test but not the full one. I have tried vitamins and had no luck, so am now trying sea kelp which contains iodine for your thyroid, you could try this. Am guessing that mine is due to lack of estrogen though as not on hrt.