There is no shame in this. Taking it easy this year will allow me to enjoy next year to the fullest. I know there are a lot of people in the same boat. And it's hard when you have to make choices of what you can & can't do, but it's only temporary. It won't be your forever life. I think the fact that you are in general alive & well enough to enjoy the day is a blessing.
This year Christmas will be different in many ways. We will divide up the dinner & gifts because it would be too much in one day. I won't be eating the usual Hungarian Christmas sweets & foods. And the hardest for me is that we won't be able to attend the midnight Christmas church service. I haven't missed that in 10 years (if not longer). Our family celebrates Christmas as a true celebration of the birth of Christ. The church service means everything to me, and has been a tradition unlike any other.
This may be a tough pill to swallow overall but my motto has to be "don't over do it, take care of YOU." I tend to want to do everything & don't want to accept that I can't. I pay the price for it later on & that's when I vow to never do it again! I'm not healthy & I have to keep myself aware of that. The holidays are easy to slip into over-doing mode.
The people around you who know & love you will understand this & help you. They will be okay with doing things more slowly & differently. Anyone who says otherwise isn't worth it, so never push yourself to please someone like that, trust me :)
Enjoy the holidays, and make this your year where you slow down & take it all in versus rushing through it.