Lump in my right throat. TSH, T4 normal, UTZ results: slightly enlarged right thyroid gland with complex cystic & small nodules. Should I be worried?

More No than Yes. The thyroid is a cystic gland controlled by hypothalamus (TSH) via anterior pituitary (TRF) to manufacture & secrete T3+T4. If thyroid cysts coalesce or locally enlarge, then cysts large enough to see via current US technology can be seen. This still indicates something not optimal but it is solid nodules which are far more worrisome &, though less frequent, far more likely to be thyroid cancer.