I had a modified rad mast in 2001, followed by 4 treatments of A/C, 12 treatments of Taxol and 30 radiation treatments. The radiation treatments themselves weren't bad. In fact, once the initial markings were completed, it took me longer to undress and get into the gown than the treatment itself. Unfortunately, I didn't have a top knotch radiation oncologist and I was burned pretty badly after the treatments were completed. This happens to some of us and others don't have any problems. I do have some scar tissue in the area that gives me problems from time to time...tightness, aching...but I have a manipulative therapist that takes all of that away with her "magic hands".
I am glad that you are here and asking questions. There is no better place to get the answers and find out different experiences.