Martin, I was in a very similar situation to you. Diagnosed in 2018 aged 55 with a PSA of 32. Biopsy found T2C G3+4, but a suspicion of undetectable spread to the surrounding lymph nodes because the PSA was anomalously high for what was found in the biopsy. RT in Feb/Mar 2019 with HT six months before and a year after. Now 2 years and 4 months after the end of RT and my most recent PSA was 1.2. Treatment not too bad at all.
You'll get through it.
Best wishes,
Chris