Hello and welcome to the forum. Did the radioactive iodine cure your Grave's Disease? That does have side effects. Unfortunately, I'm not sure if your itchy ear problems are related. They may be but it isn't a common occurrence that I have read. What about ear canal dermatitis? Wax build up that needs removed with a product that you buy over the counter (in the US there is one called Debrox, for example). Have you been to an ENT?