I've deleted my previous reply as I thought you were taking 75mcg T3.
You weren't biochemically over medicated on 75mcg Levothyroxine and 30mcg T3 but FT3 high in range can make some people feel over medicated. 5mcg dose reduction is very small and although it may help you feel less wired and anxious I think reducing for one day is too soon to affect your metabolism and make you feel cold.
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