Good Morning Ttirips,
You are one amazing young lady. You do your research well. Your fellow can be very proud and thankful for all you are trying to do.
May I suggest that you speak with his doctor now about your thoughts of putting your fellow on a gluten free diet to get the doctor's thoughts before stating the diet. Most liikely you are correct, but far better to know that what you plan to do is the right thing.
One must always be careful not to play doctor. So get on the telephone and speak with his doctor.
I wish you both the best.
RichT