I do feel sorry for you that you don't understand where this disease had got to with your dad. Has he been offered chemo or one of the newer drugs alongside the hormone treatment?
My hubby, who has had this disease a long time now (over six and a half years) has swollen legs and feet but he doesn't usually have lots of pain. When he does, it tends to be sudden and horrible but not sustained at the moment. His bladder doesn't work anymore and they suggest that the oedema is possibly down to heart failure and yet no tests have proved that. I think it's the kidneys after all his bladder and kidney issues. I can't say where my hubby is in terms of stage, his cancer is spreading, it's in his lymph but he's starting a new treatment next week, Radium 223 which is for the cancer in the bones.
Fatigue is something nearly all men with prostate cancer will get but it can get worse in the later stages, especially if the appetite is depressed or they are sleeping a lot.
I think that if your dad will allow it, a chat with the specialist nurse or your hospice nurse, if you have one, would help a lot. Sometimes, men don't want people, even their family, to know too much and don't want to know too much themselves. I would honestly ask your dad if you can have permission to talk to one of his doctors. Maybe say that your mind is working over time and possibly making things appear worse than they are. Definitely please find out about potential SCC, it's crucial as others have said.
I hope you find out what you need to know.