I have just started a trial of NDT even though my TSH and T4 are euthyroid. TSH is 2.3 (0.27- 4.2) and T4 is 16.1 (12.3- 20.2) , but I have got high peroxidase antibodies and a nodular goitre. I am only taking a tiny amount of NDT- a quarter of a grain, and my heart seems to be beating quite fast and I get hot and sweaty every now and then. I also feel slightly dizzy at times and get a bit breathless. Then sometimes I get cold extremities (fingers, feet and nose) while feeling hot at the same time! Does this mean I am actually going hyper and should probably stop taking the tablets? I don't want to do any permanent damage.