Thank you, Karen! I appreciate the information. Good advice about the TSH levels, too.

He did have radiation--two trips to the table. Since there was no identifiable tumor (because he didn't actually have cancer) his RO was aggressively carpet bombing him with rads from tip of nose to spine down to collar bone.

It's hard to know what damage was done by rads. When he had his final MRI, his new ENT did say that there were tiny benign cysts on his thyroid gland. But, he added that those cysts are pretty common. I'm sure they have no bearing on the amount of thyroid hormones he produces or that it was damage caused by the rads. But, then...I'm not a doctor.