I'm afraid I'm not a prostrate cancer patient, but I hope I can provide a few thoughts. There are others here who have that and maybe they can offer experiences.
I don't think anyone here can provide medical advice. We aren't doctors. I think many of your questions are good ones for your father's doctor. This includes alternatives and expected side effects.
You might think about getting a second opinion. I know that the major cancer treatment centers in the US treat international patients. I'm sure that there are similar centers in Europe. It isn't that I don't think that you can find adequate treatment in Homs, it's just that, if you have a difficult cancer then you want to get a second opinion from someone in the very forefront of treatment.