Lois, I never had a problem with the mask at all. However, I do have one suggestion. I have done the radiation thing twice now, just recently completing the second time. There is ALWAYS music playing in the treatment room. Have Buzz bring along one of his favorite CDs and have them put it on for him. Music works wonders!!
I have a lot of New Age relaxation/massage CDs. If Buzz in into that sort of thing drop me a message with your address and I will send some to you. I found that by playing them at home that I did not require as much pain medication also.
Bill