Take a deep breath and do not assume the worst! RAI is nothing to be scared of and I would not hesitate for a minute to have it done again. Like all cancer (and any other disease) things can change in a minute. However, the good news is that it sounds like any change has been caught very quickly. Just keep focusing on the fact that thyroid cancer is the most treatable form of cancer. However, at the end of the day......it IS cancer! So, get your treatment as soon as possible and you should be fine!