Hi John
Sorry for your situation.
Different oncologists have different views of hormone therapy during salvage or adjuvant radiotherapy. I rather suspect that with G 4+5, they are more likely to recommend hormone therapy, but it's up to you. Ask your oncologist how it will change your odds, and then you make the decision weighing side effects against chances of longevity. You might also consider a shorter run of radiotherapy rather than none - the important part is the neoadjuvant (before radiotherapy), during, and after radiotherapy (adjuvant), but becoming less important as it tails off into the distance. So you might look to do 6 months with the radiotherapy at around 3 months.
Which side effects caused you the most problems? There are things which can be done to reduce some side effects, and you should consider exercise mandatory while on and recovering from hormone therapy.