Blood tests do not predict nature of nodules. Likely need FNA biopsy. Nodules are very common and only about 5-10% are cancer.
Don't be scared. I went through a similar scare. I was so afraid it would be cancer, but the nodules were harmless. I was also told my an oncologist that if he HAD to have cancer, but could pick which one - he would choose thyroid because it is so easily dealt with.
So don't worry and stress over it, k?
I think I wrote about some of my "glow test" experience on my blog at www.wilsonstemperaturesyndrome.blogspot.com Check it out if you want. The dates go backward in time, and it was in one of my first posts, I think, where I talked about that scary time. So, scroll to the end to get to the beginning ;)
Relax and good luck!