As you are prescribed carbimazole
that need to be stopped for 4 days though you have been on steroid
medication you may menifest symptoms of hyperthyroidism
and you have mentioned the symptoms
Though these symptoms may last few days it is important to stop the carbimazole as you need to take radioiodine treatment that will permanantly alleviate symptoms of hyperthyroidism.
So please do meet your treating physician if symptoms may be persistent even after you are treated with Radio iodine therapy as the effect of radioactive treatment will appear after 3 to 4 months of the treatment. and if you cann't wait or tolerate the symptoms please meet and get managed by your treating physician.
With good luck wishess