Hi Josie,
Well, thanks to MN, I actually now know that there are LOADS of people having tense Christmases with awful family members, just like me, and that makes it easier to bear! I'll be thinking of all of you - my sisters in arms - when my parents get unbearable.
Thankfully I have whittled my time with them down to 2 days this holiday season, and I will have NO qualms about walking out on them if I have to. They can't FOG me anymore, and weirdly, it's making them better behaved with me, rather than kicking off.
I created my own "magical Christmas" this November and early December with celebrations with cherished family and friends, so I've had my dose of feeling cosy and loved-up. This year, I'm choosing to spend Christmas with my parents as a test of whether I can tolerate them, and of how much contact I am willing to have with them. I already know that I would be perfectly willing to go NC, so that actually removes a lot of the tension and pressure: I'm expecting nothing from them, so they can't hurt me anymore.
Good luck to all in the coming days: I'm sure I'll be posting on this thread to help me through it!