Don't be sorry for how you feel, Grannyscrooge. I would think that you have reached a stage where you've had enough of preparation, catering, cleaning, shopping, dressing the tree, wrapping presents etc., You say you put on a front because the family love to come to you. Bet they do. Most people struggle at some time in their lives to organise, work and pay for a Christmas and start to make their own memories. Sounds like your family need to start doing this for themselves - and on occasion organising a lovely day to include you, if you want.
You honestly need to tell your Daughter how you feel - largely about the work that having Christmas at yours involves for you. Get rid of all that resentment. You're getting older etc., and you'd like to do something different which will lift the responsibility from you. Next year, maybe?Think about that cottage. This year if you can arrange it, but you've possibly left it a bit late. Make the effort to talk to her as soon as you're able after this one. I would. Does she realise how much you struggle with your pain and disability? Adult children so often overlook the fact that their Mums and Dads are getting older. Doing anything which doesn't give you pleasure each year is really crazy when you think about it. You've done your bit, now let it be someone else's turn. Speak up and speak out (omitting the bit about the gits, perhaps) and you'll feel much better and no longer resentful. You do deserve to have the Christmas you want.