With a baseline
TSHPituitary and tsh
Tsh of nearly 3, you may have hashimoto's thyroiditis -- ask for antibodies to be tested (esp TPO-antibody) and if positive you are more likely to need meds now that half the thyroid is gone.
However, in some cases of removing half the thyroid it takes the other half about 6 weeks to take-over the demand -- so things may get better on their own.