Hi there, your numbers may be just inside the normal range, but the definition of "normal" can vary quite a lot. The problem is that the thyroid can fluctuate and particularly in the autumn and winter can fluctuate downwards. Why not try and suggest to your doc that he ups your dosage by 25mg for a month and see how you feel and then retest your bloods? I know myself the awful tiredness that an underactive thyroid can cause, so I know where you are coming from when you say that! Not fun propping your eyes open! Failing this, perhaps try another GP within your practice who does not have such a blinkered view?