Welcome, if that is the right greeting. No one wants to be here, but wow are we all glad we found this place. You will get a bunch of answers to your questions, and support from folks who have been where you are.
You are correct, each case is different. I know any rise in PSA is troubling.
I'll tackle the question about follow-up radiation. You are correct that it will be many sessions. I had 35 sessions (five days a week for seven weeks). It really wasn't too bad. Takes about 10 minutes, and you don't feel anything. It has side effects, includng fatigue, which may linger long after the treatmenst are done.
I had "adjuvant" radiation, which is radiation done before my PSA rose above the 0.2 threshold. Once the PSA indicates a recurrance, the same radiation is called "salvage". I opted to bombard the prostatic bed while the cancer was as small as it would ever be. It may have never returned, but I wanted it shot with every gun in my arsenal.
Ditto on the diet. No red meat, dairy or white bread here. I keep the pomegranate famers in business.
Bless you, and remember that a positive attitude is good medicine!
Rev. Bill in San Diego