Baba,
From what I gather from aquaintances with same problem the treatment using carbimazole takes time. On the average it took them 4 to 6 months before they were declared euthyroid after which the go on a reduced dosage and then on a maintenance dose for about a year. One lucky guy's thyroid's problem burnt itself out; the other two's symptoms returned and they were again put on a treatment regime which prepare them eventually to undergo the radio iodine therapy. Hope this help you prepare yourself for frustration as your treatment gets prolonged.