@sue417 I had radiation therapy for endometrial cancer (pelvic radiation). Twenty five sessions. During the radiation I walked every day and kept up with my exercise sessions for about one hour two times per week. I was fatigued off and on. The fatigue really set in after I finished the radiation therapy but it let up within a few weeks later. I'm thinking that the radiation affected the fibromyalgia and so kind of makes sense to me that you are even more fatigued. When you met with your radiation oncologist (I met with them weekly during my radiation therapy) did they have anything to say about how radiation therapy would affected fibromyalgia?