Yes, I think that sometimes the doctors give out little information and we take the small amount gven and build a worst case scenario in our minds. A philosopher once noted that "the things that he most worried about in life were the things that never happened'.
By the way, I see that you have lymph node involvement. Are they planning to do full pelvic radiation in addition to the prostate bed? My first 25 sessions were a combination of pelvic and prostate specific.