In addition the response to thyroid hormone, mentioned in the definition, is affected by a number of variables such as Reverse T3, cortisol, Vitamin D, B12 and ferritin. So
I recommend that you get those tested, along with
Free T3 and
Free T4. Then you will be able to confirm to the doctor that you need to add a source of T3 to your med, while reducing your T4 dosage. In addition you need to know if you have excess Reverse T3 or low/high cortisol.