Making a plan of what you will do ahead of time, may be a good idea to help you cope during these stressful times. Have the phone numbers of friends and crisis lines available to you. If you have to be at a function with certain people who make you uncomfortable, plan ways to excuse yourself from their immediate presence. Try not to count calories and try to avoid the scale. If you feel yourself starting to panic because you are feeling too full or if you allowed yourself to eat foods that you consider to be forbidden, remind yourself it is okay to eat what you did, that food will not make you fat, and it is only normal to eat more during the holidays.
Most people do and it really is okay.
If you have a period where you end up bingeing or purging, do not beat yourself up over it. Just put it behind you and move forward. Prepare responses to make to people who may say something to you that would make you uncomfortable. If you feel you need to, set some boundaries for yourself by telling people ahead of time that you do not want anyone to comment on your appearance or your eating. Be sure to plan some time for yourself to do something that you enjoy.