Believe me, I can soooooo relate! I'm dreading Thanksgiving, and don't want to go, but I'm going to get it over with on that horrid day, and try not to think about it until my butt hits the chair at the dinner table.
I wish things were different for us both. Thanksgiving should be all the things that the commericals on tv make it look like, but it isn't.
Just know it's one day, and there are countless others who feel your pain. You are not alone. If I could make the day disappear, I would, but I can't. All you can do is the best you can do.