I had Thyroidectomy in 2012 in London and Radio Iodine treatment. My cancer still had not gone so they increased the levothyroxine to 125mg. Before I was taken 100mg. The high dose of thyroxine is causing lots of side effects due to high level of thyroid hormone in the body but is not getting rid of the cancer either. It is only suppressing it. So I came o the USA for a second opinion and the doctor said he thought it would be good to reduce the thyroxine and give me more radio iodine therapy. He said the 125mg is not curing the cancer only stoping it from growing. He is refering me to Euston. Can anyone advice me further.