TSH is a pituitary hormone and is not indicative of actual thyroid
function. You need to have the actual
thyroid hormones tested... those are Free T3
and Free T4, with FT3 being the active hormone and FT4 being a storage hormone that must be converted to FT3 before it can be used by the individual cells. If those tests were done, please post the results, with reference ranges.
How was the mass on the right lobe of your thyroid detected? Is it really a "mass" or is it a nodule?