Eating is fine if you are eating SW friendly foods, which I suspect you aren't.
So you are 'telling yourself' you will be fine as you can lose the weight after Christmas, but on the otherhand you don't want to put any weight back on.
So what foods are you eating which aren't SW friendly. Is is possible you can try & make the SW friendly or low syn?
Why are you constantly eating, are you hungry, feel like you've blown it anyhow so it doesn't matter, or what.
You have two options, you can either continue as you are & get back on plan after Christmas, but you need to accept you will have a gain, would you be happy with this.
Or you can get back on the plan now, search through the diaries on here & find foods which you'll be happy eating.
This time of year is difficult for all of us, from all over we are bombarded with cake, mince pies, cream, chocolates, drink......... we can have these things but they need to be taken out of our syn allowance.
Good luck you can do this.