The fatigue is annoying to say the least. I have always been very active, but this year I have had surgery, hormone treatment and am five weeks into radiotherapy. I'm knackered! I'm self employed and have an active 9 year old daughter, so I'm obliged to keep going really. Today I did a 2 hour hill walk which took its toll, but I'm glad I did. If nothing else, it builds a healthy appetite and means good sleep. I'm dreading next weekend though - my daughter wants to go climbing in Snowdonia, which will involve all reserves being called on.
I agree with the top tip of doing exercise, even when the head and body say no.