My husband had low hemoglobin after his second chemo. At the time, the MO said the only way to boost hemoglobin was through transfusion, but John's count was not so low as to justify it. The body is really on a very delicate balance during treatment and every little thing can tip it. Your husband will take a long time to overcome the fatigue. It is the number one side effect of radiation and can last for months. Talk to the doctors about how you could get nutrition into him at this point and let them know you are having difficulty getting him to comply. Maybe the doctors could read him the riot act. He may not listen to you but maybe he will pay more attention to the doctors. All the very best to you. Caregiving is a hard job and you are doing your best.