I like to be on top of the world, as most of us do, but I haven't done very well in the past when I sink into "maintenance mode" rather than aspirational mode. What I learned from my last stumble is that I AM MY OWN WORST ENEMY.
Get your butt on the trail to recovery and fitness at that same time. And then, if you don't, don't sweat that either. It's easy to be hard on yourself during the holidays. But your own peace of mind, and your own acceptance of yourself, just as you are, is the most important thing you can learn this season.
How do you reconcile being removed from the typical family Christmas? How do you deal with the 22 days a month that you have little or no contact with your children? How do you afford ANY Christmas presents when you're struggling to buy gas?
If your kids are old enough, talk to them about how they would like to do Christmas within the schedule you and the other parent have determined. Over time, it does get better. But while things are fresh and hard, make sure you take care of yourself first.