Hi Andy,
Welcome to the forum, mate.
I'm very sorry to hear that your prostatectomy was not totally successful and that the follow up radiotherapy has also not got rid of the problem.
Was the prostatectomy robotic?
Did you have H/T with the salvage radiation treatment?
Do you know what your PSA was prior to surgery. What was your Gleason score and cancer staging? Did you have any positive margins? What were your post op PSA levels following the operation, and at what level did they start salvage treatment. Do you know your current PSA levels? Have they established exactly where the remaining cancer is?
I'm sorry to fire so many questions at you, but they are relevant.
There are a few fellas on here that are in a similar position to yourself. I'm sure that they soon be along and help out. 👍