I suppose what happens next depends largely on your oncology team's analysis of your post op histology and current rises in PSA. I think at some point, you're heading down the salvage radiotherapy (SRT) route. I had 20 fractions of SRT two years ago and found it quite easy apart from the daily grind of driving on the M25 to and from Mount Vernon.
As for questions, I would ask:
At what point do you go for SRT?
Will it involve a scan?
Will it include HT?
How many fractions of radiotherapy?
Just prostate bed or wider?
Good luck,
Kev.