1) Try to focus on making the holidays as wonderful as possible on your significant other or family members. I really foud joy in trying to find the perfect presents for everyone and watching them open them.
2) Do as much online shopping as possible. You do not want to be in one of those "negative beta" type moods and bump into someone you know waiting inline for Santa with her newborn. Or anyone with a newborn for that matter.
3) if you can afford it, Treat Yo Self here and there whilst shopping for friends and family. Chances are non of your ungrateful siblings are going to get you anything you actually want anyway, why not have something under the tree from you to you?
4) Know that it's ok to say "no". You can sit out events that you don't feel like going to: no one wants a Debbie Downer at their holiday party anyway so if you know that you just can't grin and bear it for a few hours, give yourself the okay to skip it, send a bottle of wine with your significant other or send flowers or a note the next day. It's not as much about you as you think and people will have a great time with or without you, no matter how awesome you are.
5) If you must attend an event that you're not feeling up to, suck it up and tell yourself that it won't be as bad as you thnk. It most likely won't and if you're really worried about it, practice a "worse case scenario" scene in your head on the car ride over there: imagining that your hair lights on fire or that every single person in the party is pregnant except you is never going to happen but if you imagine it will, it will make you feel better about whatever does occur and ensure that you will survive.
6) Do something for others. Donate time, money or used items to a shelter - animal or homeless! It will open your perspective greatly.
7) DON'T get caught up in what you don't have. It's hard, I know, trust me but when you start thinkng about how you wish you could leave cookies out for Santa or obsessing about what you wish you could buy your nonexistent kids or looking at those darn Pinterest pins that make holidays look so perfect that really no real busy mom does anyway, you're not doing yourself any favors and you're not allowing yourself to live in the moment and therefore missing out on the potentially beautiful things that are happening around you.
8) Start a tradition with your significant other and/or other child free friends. Naked Christmas Eve? Yes please. Drunken hot tubbing on New Year's Eve? Why not? Live it up now before you have to worry abut babysitters and feedings and such.
9) BREATHE. It will be over before you know it and in no time this entire period will be just a memory while you're celebrating with your own sweet little family.