I understand this is scary for you. I wanted to share with you that my mother had thyroid cancer. It is highly treatable. Back in the 60s when she had it done, they just took out her thyroid and gave her medicine for the rest of her life. They may have advanced since then . I wouldn’t worry too much if you could try not to. Regarding the procedure, I’m sure they’re not cutting into you without giving you some kind of anesthesia local, etc .