I finally was given enough thyroxine to allow me to feel normal for the first time in years (FT4 at the higher end of the of the normal range). I felt fine for about 18 months then started to feel really unwell again. My blood test revealed that my FT4 levels were at the very low end of the normal range (would have been below normal had the NHS not changed the range). I don't understand why this would happen?
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