radioactive iodine treatment

I went to the Mt.Sinai Hospital to see my doctor. According to the blood test, my thyroid levels are gettig better than the last result, but she told me that my hepatic function(liver) got worse this time. Doctor recommended me the radioactive iodine treatment. I thought I had no choice. Because this is the forth time hyperthyroidism since I was 15. and I sufferring from some side-effects as an itching of the skin, loss of hepatic function. I told my doctor that I don't want to become hypothyroid. Then doctor arrenged small dosage. My dosage is 7mci. I don't know this dosage is good small for me. Nobody knows.