I agree with the others. It's painless during the treatment and it often takes longer to get you lined up for the treatment than the actual treatment takes. I am not sure of the side effects for your type of cancer but I would discuss that with your doctor or nurse. Also, the effects are cumulative so the first couple you won't have and side effects but they gradually come or might not at all. Also, even the week following, the cumulative effects will still be there. My worst side effects occurred the week after I completed my course.
As a way to get through it, I did a count down till I was finished. I had 28 treatments so I put $28 in an envelope in my car. The hospital I went to had free valet service for patients getting treatment. I would tip the valet $1 each treatment. It's a really good feeling to see that wad of bill go down and taking the last one out was the best feeling ever.
One last thing to note. Some people are really bothered by side effects and need to take a break for a day or two. If this happens to you, don't see it as a sign you are not doing well. Lots of people need breaks and it is just part of the process.
Good luck! I just got released from my radiation oncologist!