Thanks for all the replies everyone.
I have tried to get him to have his hearing tested for hearing aids but he refuses to go. He says the problem is tinnitus and says that they won't be able to do anything for that and refuses to believe that he's going deaf. As he still has "capacity" I can't force him to go so nothing gets done about it. He also refuses all contact with befrienders (I tried to set it up and he insisted I cancelled it before he'd even tried it) and also refuses to go to day centres and the like, saying he prefers to keep himself to himself. I've tried to get him to do a hobby of some kind but he refuses that too. All he wants to do is sit on his bed and watch television. Watching television is the only thing he's done for about the last thirty years, even before he got old. But he's not happy with this - he says how small his life has become, just sitting in his room watching TV, but refuses to try anything else.
He wouldn't be interested in DVDs as he doesnt like films (neither do I) and he doesn't have a DVD player.
Crosswords are difficult as he can't see well (macular degeneration). He used to do them, but wouldnt be able to any more.
He turns the TV off when I visit, he's from the old school of "the television must go off when vistors are here", so we don't watch TV together. I don't watch TV at home, so when he says "did you see x programme" (his sole topic of conversation), I have to say "no", and then that's that conversation over with.
I've tried asking him what he'd like to do, he says "I don't know" or "nothing" or "whatever you want to". Then he keeps asking "what are we doing next?" and I don't know what to do.
We don't really have any photograph albums. He has a couple of pictures of my mum, and one of his mum, but nothing else. And again, as I said, there are no nice memories to discuss.
There's no housework to do to pass the time as he has a carer come in once a day but he won't let them do very much, except clean his bathroom and running the hoover round occasionally. It's an endless fight at the moment to get him to allow them to do things like wash his bedding - he refuses to allow it, saying "My daughter will do it for me", and they can't force him, even though I've told them I'm not able to do this for him. I can not do these things for him - I am disabled and am managing long term health conditions - if I take his washing away to do, there's a chance I might not get back with it for a fortnight if I'm unwell. So these things don't get done, because he refuses to allow anyone else to help him.
I am at my wits end. I've no doubt his life is awful, but he refuses any attempt to make it better, and only wants to speak to me, or to have me visit, or to call me twice a day. It's like he's replaced Mum with me, after she died, and that's not healthy, and it's very unnatural as we had such a bad relationship when I was growing up.
And we literally have nothing to talk about. Not a thing. There's no point me telling him about my life, he talks over me or changes the subject and starts talking about something else.
This was in the post that got deleted (I don't know why Mumsnet deleted it, they've refused to say) but to the person who says I am allowed to be unavailable when he calls - If i do that, he calls every two minutes until I pick the phone up. He will not leave me alone. I can't turn my phone off as I need it on for myself.
I guess I just don't know what to do any more.