What are the actual levels of your T3 and T4, with reference ranges? Just because they're within the labs so-called normal ranges, doesn't mean they're really normal.
A toxic multinodular goiter is when nodules produce thyroid hormones, independently of the thyroid. Meaning - they don't respond to the lower TSH that's telling the thyroid to stop producing hormones.
Does the report contain an "impression" or recommendation? Typically, they will say whether they recommend FNA (biopsy) or other action to be taken.
Since a toxic nodular goiter is not the same as being suspicious for cancer, you won't necessarily require biopsy, but, at some point you may need surgery to have your thyroid removed, if anti-thyroid medications don't stop the nodule(s) from producing hormones.