Mary,
Sorry to hear that your husband is dealing with this, but I too went thru this and it will slowly improve. My Radiation Oncologist told me that we will battle fatigue for roughly 1 year after our last treatment. Mine was a bit longer then that.
With that said, there could be some other issues that are worth mentioning. First is the amount of daily Iron we take in, hopefully he is taking enough in with the Ensure. For men over 19, it is 8mg per day. The treatments cause us to become anemic.
Secondly, we need to keep an eye on our Thyriod levels (TSH) when we have bloodwork done. My Oncologist told me that my thyroid would more then likely fail in the future. It did, but it took 5 years and then my energy dropped off the table. I'm on med's now and the energy is back up.
A question for you on the blood pressure medicine. Did you husband stop taking the blood pressure medicines cold turkey? If so, that could be the problem with his lack of energy as well. I was told that if I ever were to get off of the blood pressure med's I would have to wean off of them...not stop suddenly.
My Best to Both of You and Everyone Here