Hi fT3 and low body temperatures when rT3 is rT3 is ‘normal’. This suggests that the rT3 range might be inappropriate.
You could experiment with more NT.
You make your own anastrozole in Vodka if you have the pills.
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You could ask for 25mcg T3 in a time release compounded product and try that stopping NT. You would need to drive TSH and T4 down and watch body temps. Your case is odd and you will have to experiment with a cooperative doctor.