Prostate cancer returned after 8 years

I remember being on this forum 8+ years ago and received amazing information and help. I had robotic surgery which was very successful. PSA levels were fine all of these years. My PSA was .02 and Urologist sent me last week for a PET scan. Showed it is now in lymph node of rectum. Appointment next week with Radiation Oncologist for salvage radiation. Anyone have any experiences to share?