James, I am sorry to hear of your problems, however please don't worry about your forthcoming RT treatment.
I had 37 sessions over 8 weeks and although I did suffer some side effects, the end result of beating Cancer was my goal and hopefully that has been achieved.
To try and reasure you, not everyone has many side effects and some people have none at all, everyone is different so you have to take things as they come.
I was lucky, I only had a couple of serious SE's, the soreness of passing urine after about 4 weeks and bowl soreness after about
5-6 weeks, plus some diorea, which they give you Imodium to help with the problem.
The only SE that seems to be a constant with nearly everyone is the tiredness but I found that when I came home I went to bed for a couple of hours and this made the problem easy to cope with.
The one thing to remember is do EXACTLY as they tell you, I stuck to their information/instructions to the letter and I feel I have had a relatively trouble free journey, but some of the guys I see every day at the unit don't bother, they carry on eating spicy foods, drinking coffee and fizzy drinks, and not drinking the requirerd 2 litres of water a day to keep hydrated and then complain they are experiencing some awful SE's.
From my perspective you get out of anything what you put into it so for me it was a no brainer not to do as I was told.
I do hope my the information on my journey is helpful to you and that it eases your mind on undergoing your forthcoming RT, for which I wish you well and that you get a good outcome.
As an aside, a guy I met at the unit who has become a good friend over the past few weeks has had the same operation as you and unfortunately had the PC come back in the Prostrate bed, and has had to undergo a course of RT, he did the same as me, stuck to the insteuctions and other than tiredness has suffered very little and he is over half way through his treatment.
Good luck with your treatment and if you would like to know anything else please get in touch.
Harley