Aurora, I think the most typical thing about
this disease and the side effects of the treatment are the very different nature of the side effects for us all. It makes it hard to predict what will happen when the side effects vary so widely.
I might suggest seeing your primary care doctor to start a good workup, including blood tests. it could be that you are anemic or perhaps dealing with another autoimmune disorder. It would be hard to say whether radiation contributed to the current problem, but certainly should be brought to medical attention.
Keep us posted.