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Since you are taking such a high dose of T3 have you shopped around for lower cost brands? Uni-Pharma T3 and Tiromel T3 are usually quoted as being the cheapest available that people on this forum use.
It may be that you need to eat more than you do. If the body goes in to famine mode then it will hang on to flesh like grim death rather than lose it. Eating more may help your legs too. What kind of diet do you eat?
If you don't have any test results you might benefit from getting some done. Iron and vitamin D can both become toxic if taken to excess. B12 can be hard for some people to raise and you might need injections. Your folate may be inadequate.
Many people on here get testing done by Blue Horizon Medicals. For more info :
Look for the Thyroid Check Plus Eleven on the above website. The microtainer version of the test is a finger-prick test, the vacutainer version of the test requires a blood sample to be taken from the elbow like you would get done by a nurse or phlebotomist. No doctor's permission is required, and the whole process is done via the post. Results are sent via email.
If you do go for private testing you should stop taking your supplements for a week before the blood draw. Don't take meds for 12 hours before the blood draw. Do the blood draw first thing in the morning (before 9am), fast before it (except for water). You can eat and drink and take meds freely after the blood is taken.