I've said before that I believe that most cancer survivors suffer post traumatic stress and your symptoms certainly seem to fit that profile. I have had times when I've had to force myself to go and do things that I used to enjoy and now it's almost like doing a chore. But I have gotten better about that, it just takes getting your body in motion, which is easier said than done. Radiation will take a lot out of you and you will probably be fatigued for a while but, as they say, a body in motion tends to stay in motion. Best of luck and strength to you.