I read this post this other day, and despite no longer being an active mormon, I can relate. I too would not make it through the holiday season without boundaries. There is simply a lot to do. And I prioritize what I do.
And - I don't do busy work during the holidays to make the holidays the best ever for people around me (which I used to try to do).
I have a habit of trying to do too much in order to ignore whatever is going on around me (and the holidays are a great excuse for this). Trying to please others constantly is usually a recipe for disaster. Being kind to other people, being other-focused are fine; but focusing on my feelings and needs are important.
Some things that have helped me during the holiday:
-I try to work out regularly and plan time to work out
-I make sure to eat plenty of fruits and vegetables (it's easy to try to get one's kids to eat veggies, it's much harder to remember to eat them yourself).
-I try to sit underneath one of those SAD lights on a regular basis
-I take fish oil and vitamin D
-I don't go overboard with baking
I'm mentioned it before, I wasn't really taught how to do all this stuff growing up. I was taught how to bake, wasn't necessarily taught to say no if someone asked me to do something.
I agree with the "be the change you want to see in the world" philosophy. So I have to take care of myself first, be aware of my own needs, and then reach out to others. I focus on the present and what's going on now instead of outcomes.