I see there are 2 of these threads so I am re posting my reply here.

Hello Kim, Welcome! I am no psycologist but from my own experience the effects of this disease and the treatments affect more than just body. Many people suffer a tremendous blow to their mind and spirit as well. I would not be surprised if your father is suffering from depression. The effects of treatment could still be causing his tiredness but it might also be a problem with his Thyroid (caused by radiation). I found it a considerable amount of real work to keep ahead of physical and mental challenges, a person sometimes really has to lift themselves by the bootstraps! Sometimes we need outside help with that lifting.

My suggestion is that you get an appointment with his regular doctor and go with your father. Tell your observations to the doc. Ask for a thyroid test (simple blood test) and ask for options about dealing with his mind and spirit. There are many effective anti-depression treatments. I think with your continued support you can help him out of this.

In addition Kim, the stiff neck he has can be helped by excercise and sometimes psyical therapy. I had problems early on post treatments, but with time and stretching I have regained almost all the flexibility I had pre-treatments.

take care