Hi Stuart,
I've had similar treatment to you, EBRT end of Nov 24 - beginning Dec 24, then HDR brachytherapy just before Christmas, I found this generally not too bad. On HT for 2 years which will finish July 2026.
I'm much more tired than I used to be, though not to the point it's stopped me working, I'd put this down to the HT. I did think symptoms for this had plateaued after the first 6 months, but recently hot flushes have got more frequent and intense.
Maybe other HT side effects can worsen over time too? I've tried to keep up with exercise to try and combat the fatigue, I think it helps as I find when I'm active I can keep going, its when I stop and sit down that it hits me.
John