Your TGab is elevated, which indicates you have Hashimoto's thyroiditis. Nodules are very common if you have Hashi's. If they're less-than 1 cm, with no alarming characteristics, they're usually just monitored for changes. So, your doctor's advice on the U/S is pretty standard.
Please post your actual FT3 and FT4 levels with reference ranges. Ranges vary lab to lab and have to come from your own report.
How were you feeling before the increase to 150 mcg? Were you having hypo symptoms? Is she only planning to test TSH every two months?
Right: The right lobe measures 4.2 x 1.4 x 1.6 cm. The right lobe is heterogenous in echotexture and demonstrates multiple tiny heterogenous hypoechoic nodules, the largest measures less than 1 cm.
lobe size normal; texture suggests inflammatory process
Left: The left lobe measures 3.4 x 0.9 x 1.2 cm. The left lobe is heterogenous in echotexture and demonstrates heteregenous solid nodule in the mid left thyroid lobe, measuring 0.8 x 0.4 x 0.7 cm.
Same as above ; nodule can form as result of inflammation ; not clinically significant based on its size.
If nodule forms in otherwise homogeneous gland it is more suspicious if nodule formed in the gland with inflammatory process