Doot, most people are on Carbimazole for 12/18 months before being weaned off. It looks like you were on too high a dose when your TSH was 4.11 but your latest results look good.
Doot, TSH usually rises when FT4 drops. Yours look about right now but if TSH rises it means your dose needs decreasing slightly to prevent you becoming hypothyroid.
If your TSH drops lower than just under 1.0 and your FT4 rises over range you may be becoming hyperthyroid and need a slight increase in dose.
This is why blood tests are done at 4/8 week intervals to avoid over and under medication.
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