Dear Minnie,
I have emailed other thoughts and won't repeat them. It sounds like you are gonna come out of this fine, though I am sorry that you have to go through it.
I had a "cold nodule" on my thyroid many years ago. They couldn't definitively say that it wasn't cancer, so I had surgery. (I had had radiation in childhood as a treatment for swollen glands! EEK!) I recall that at the time of my surgery, I was told that even if it were to be cancer, I would "die WITH it, and not OF it."....In other words, unless left totally un-treated, thyroid cancers are curable and that I would die of something else eventually (of course) but not of the thyroid cancer.