Please do not be afraid of radiation. It is not at all painful. So,e people do get tired from it, I a, told. I DID NOT get tired at all. I also had ductal Ca. One thing I do have to say is that after 20 years, I had to have a mastectomy ( same breast as ducal Ca); however, the doctors do not know at this time, if the distal Ca spread or if it was a new Ca. Also, some years after my original distal Ca, my oncologist moved and never advised me & I foolishly never sought another oncologist so it is very possible that my mastectomy could have been prevented. Sorry for the long story. I truly wish you the best.