The side effects are exactly the same Mike - have they told you yet whether you will have 37 sessions (usually at 2Grays each) or 19 or 20 at a higher dose? John had 20 sessions at 3.2Gy which was a trial at the time to see how high a dose they could go without causing too many side effects but I think it is more common now.
He breezed through it - was lucky that the hospital booked all the appointments at the start so he chose the first slot of each day, went in at 8.30 and then carried on to work. He didn't need any time off at all although he did nap a couple of times on his desk towards the end!!!! He also managed to still go to the gym most evenings and played rugby on Saturdays - he was very fortunate not to have any side effects or problems at all.
The hospital will give you advice re diet - some men are told to go on a low fibre diet while others are told the opposite - I think it is partly determined by how gassy you are and where your prostate bed lays in relation to your bowel. Almost everyone is told no fizzy drinks, no caffeine, no alcohol. John stuck to his diet sheet rigidly.