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What I can't figure out though is why someone would present with symptoms of hyperthyroid (in this case, palps/PVCs) and have totally normal or even low normal TSH and FT3 levels. Then again, I hear from endocrinologists that symptoms like heart palpitations, tremors, sweating, anxiety, and insomnia may occur even if the TSH is within the normal range when taking too much T3 or NDT (even worse when iron/ferritin is low).  I guess the only thing to do is drop my dose, wait and see...