radioactive iodine injection for hyperthyroid

Is radioactive Iodine ever the only or the best solution? My doctor is recommending it for my current state of hyperthyroidism with goiter and rapid weight loss. I feel like once the stressful situations in my life that gave rise to the hyperthyroid episode even out, my thyroid situation may calm down and normalize so that such a drastic treatment would not be necessary. Am I being naive? I am not a doctor or a medical expert. By the way I stopped taking my 4 Iodoral a day about a month ago because the rapid weight loss scared me and I was afraid the Iodoral might be pushing me to hyperthyroid somehow. Now heart rate is high and doctor wants me on Metropolol, a blood pressure medicine that he thinks will protect my heart from the raging adrenalin.