You underwent appropriate treatment for your hyperthyroidism
, i.e, radioactive iodine
therapy as you were not tolerating other oral medications or they are not good for long term. Now you being on levothyroxine
means your TSH might have gone up and hence your Endocrinologist
put you on it. But most of the people who undergo radioactive iodine therapy need higher doses of levothyroxine, may be 100 to 150 microgram per day. Heaviness in legs and feeling uneasy with different symptoms is part of hypothyrodism mostly. Hence you will wait for another 6 weeks with the current dose and repeat the thyroid function tests
and see if the TSH level has come back to normal or still higher to warrant your Endocrinologist to further increase the dose of LT4. That will give you relief further. Be patient and meanwhile try vit D supplements if you have never taken. That will help partially. So give yourself another 6 weeks. All the very best.