Hi,
I think it's really hard for us to understand the incredible fatigue that cancer patients experience. Everything contributes to it-- the treatment, the meds, and the disease itself. Interaction with other people does take energy, and it sounds like your husband does not have any to spare. It is definitely worth discussing with his doctor. I think it also is worth looking into treatments like Reiki which might help him feel better and don't have negative side effects, if he is receptive. He may just need to be left alone for the time being. Roz