Hi, you have posted the right place. I know all about it!! My husband had it come on about 2 months after treatment ended. It came on almost overnight and was so chronic before he was able to get the CPAP machine that he was taking 4-5 breaths and then nothing for 35-45 seconds. I have searched to find anyone else with this side effect, only 1 who noticed issues breathing but it resolved about 6 months after treatment ended. Have met with 2 different doctors who deal with sleep apnea and they have not had anyone with sleep apnea that had gone through radiation. How bad is your husbands swelling from the lymphedema? My husband's got so bad that he would wake up in the morning looking like the HULK from the kid's program. His therapist came up with trying a cervical collar that has worked wonders, so much better than the compression mask that did not work well with the sleep apnea mask.

He is now 10 months out of treatment and I had really hoped to get rid of the machine, I don't like going to bed with a fighter pilot and he doesn't enjoy it either. His breathing is much better now, last week we were out of town for the day and decided to stay overnight and he made it without the machine although he woke up often and did not feel as rested. Before he had the machine he was so tired he would fall asleep driving and even at a stop light so I didn't let him drive alone much. If you have more specific questions, feel free to ask.