Lymph Nodes, Ultrasound and monitoring

It's been a while, things have been going well. The scar is visible but disappearing, I've been running faster than ever, riding my bike, doing strength work and I started swimming too. I have been really good about working out except when I get sick which has been more frequent than normal. Cold, flu, strep throat, you name it. If it goes around, I seem to get it. I still get out of breath faster than I should and last weekend when I ran, I hurt my hip. And this is when you start hearing the violins - I had strep throat over Thanksgiving and lymph nodes swell when you get strep throat. But it has been 5 weeks and the nodes are still swollen so I spoke with my Endocrinologist and he had me get an ultrasound because the swelling is on the same side that the cancer nodules were on. The Ultrasound was yesterday morning and on the drive home from the appointment my Endocrinologist called to let me know that he wants me to have a biopsy because the ultrasound revealed a nodule that needs to be checked out. It is suspicious for metastatic disease, it has micro-calcifications, it is 1.0 x 0.6 x 0.6 cm and it is new since the ultrasound that I did in September (4 months away). Until the biopsy results come in, I shouldn't worry but that is hard. If it is a recurrence, then how can Thyroid cancer be a slow moving/slow growing thing? Does that mean I would need to have another operation, my third within the year? Should I have RAI now and if not, why not, I think I might need it. Anyway, I will stop for now and let's see what the biopsy shows.