Re: 2nd biopsy in 6 months, is this the norm?
With breast cancer, you must find the cancer ASAP, and if it spreads, it's very dangerous, and you must act fast in the hopes of preventing that.
With thyroid cancer, it is very slow growing, and even if it does spread, it's usually within the same area, and it is treated the same whether it spread or not. It is not a deadly disease.
So, it's pretty normal for doctors to recommend a revisit to the nodule in 6 months. If you feel any changes or growth, go earlier, but if you waited 6 months, it's normal to observe it for a while.
Yes, the only way to know for sure is to remove it, but there's no emergency rush to do that. Most are benign.