Re: Question about effect of stress.
Your cancer probably developed about 8 years before you found it---possibly even more because this is very slow growing. So if your stress caused the cancer, then it was from stress a loooong time ago. More likely, there is someone in your family tree that had cancer, or will be diagnosed, because cancer is usually genetic---it can be a different type though. I had thyroid cancer, and I now since diagnosis have relatives with other types of cancer.
If it's your fna is suspicious, you still have a likelihood of this being benign.
Hope you have a really great and experienced surgeron---wishing you benign results and an easy surgery!