Radioactive Iodine for Thyroid nodule?

Ive been told today I have a nodule on right lobe (hot spot) that is making my thyroid hyper.... so im subclinical hyper... suppressed tsh BUT t4 and t3 are in range. My ONLY treatment is to ignore and leave it (keep it monitored) and remain with symptoms, or a small dose of rai to kill the nodule. I was advised once the spot is treated my tyroid should function normal again. Does this sound right? Has anyone gone tru this. Please let me know if this is harmfull as well. TY VM