Gwenny,
It sounds like Jimmy is starting off in good shape in that he has you and so much supportive family, not only nearby, but living in the same home. It also sounds like both you and Jimmy have a great attitude from the start. Most of us here, including myself, got a feeding tube during radiation and in my case, it has been the least of my worries. In fact I still have mine and work and play golf with it under my clothes with no problem.
What I think that you will find is that Jimmy will have good and bad days. In the case of a lot of us here, it got worse once radiation ended. But, little by little, he will start feeling better. As he goes along and you have any concerns or questions, post them here because so many of us have experienced the same problems and can help you. When I was in need I found a lot more comfort on this forum than I did from any of my doctors or nurses.
Welcome aboard and we will all be pulling for Jimmy and you.

Take care,
Danny G.