I had RAI over a year ago for hyperthyroidism, multi nodular goitre. Within two weeks of treatment, my TSH had risen to 2.5, my endo rang me to say it had already worked and he was prescribing me Levothyroxine. Over the next 12 months I had stabilised to TSH 0.85 with normal FT4 and I was able to take levo 50mg alternate days and he agreed to discharge me back to GP care on repeat prescription, allowing me to titrate myself off the medication if I felt well (it was possible my nodule had been zapped by the RAI and I hadn't incurred damage to the thyroid). After a while I asked my GP if it was okay for me to stop medication, she agreed as I was still stable. I have been having blood tests regularly, TSH has been rising slowly, not over the range and last week was at 1.8 with FT4 in the upper range, GP said it was normal but as I was feeling more tired than normal I asked if she would prescribe Levo again. Reluctantly she put me on 25mg daily (rather than alternate 50mg a day). I had some levo left from previous prescriptions to put myself on 50mg daily for a few days before reverting to the 25mg a day. Weirdly, I am now feeling even more tired, like walking through treacle and I seem to be gaining weight. Is this possible on levo?
Any help greatly appreciated, thanks.