TSH is only part of the thyroid puzzle.
Please check oral body temps as per the thyroid link.
Are your outer eyebrows sparse/thinning?
Get cold easily?
Have you been using iodized salt?
fT3 regulates the metabolic rate of the mitochondria inside your cells and thus your body temperature. So temperature is the bottom line. If rT3 is elevated, it can interfere with fT3.