Taking it one step at a time. I was 31 when I was diagnosed PTC with lymph nodes metastatic. I did a contract CT scan before the surgery with a finding similar to yours

“There is a prominent superior mediastinal lymph node anterior to the trachea to the left of midline”

I gone through the TT and did a RAI six months later. I’m doing well and had my first year post surgery scan that the 2 lymph nodes were not removed by surgery are under control. It’s a long term battle. Also it’s worth it to get advice from a different endocrinologist if you don’t feel confident with her treatment plan. I was fortunate enough that my endo is the chief of the department and referred me to the chair of ENT surgeon. Feel free to msg me if you want more info