Thinking of you, Paula, and knowing how hard it is.
When my husband was in a similar position he too didn't want visitors. He asked me to keep them away, and said he didn't want them to see the reality, as he found it difficult to make the effort to talk. I think many men are used to being the 'fixers' in the family and this is beyond fixing. In particular he didn't know what to say to make it better for his mother and daughter.
My brother was similar and didn't want his son to remember him as he was at the end. I know how hard it can be to live through it though, and really feel for you.
Take care of you, Janet, x