Hi nurj, best of luck with your treatment. The scan will indicate whether it is Graves Disease or other thyroid problems. Be prepared for a protracted period of treatment with carbimazole. The posts by Caboclo, Re-Heat, Raj Merlion, SpaceNeedle are especially helpful. Watch out for the side effects of carbimazole which I believe yout endocrinologist will brief you at length.
I am completely euthyroid now and my endocrinologist is slowly weaning me off carbimazole. My thyroid hormone levels are still monitored every month.