Hi I have had an underactive thyroid for 20 yrs and take 250 mg thyroxine per day. I have started working late shifts till 10 pm and after about 7 I get so fatigued and I cant think straight. I take my tablets at 7am , do you think it is my condition making me feel this way? do the tablets start to wear off late at night ??? really thinking I should not be doing late shifts
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