Awww John, dont worry about Christmas already, but it is wise to plan ahead, now tell us what you tend to eat at Christmas, what do you really HAVE TO HAVE. Is it cake, mince pies, trifle? There are usually some ways around this, recipes can be adapted, they might not taste exactly the same to what you got used to, but hey we need to keep a flexible mind and willing to try out new things and who knows we might even like them better.
Its not a good idea to go totally overboard and then end up in hospital, its not worth it, one day of going crazy over food that you enjoy for a few short minutes only but could end up regretting for months afterwards? Think about it....
You are still fairly newly diagnosed so of course all these things will go through your mind, you know and also accept that you do need to make some adjustments and you should feel very proud of yourself, other people, like myself rebelled against the diagnosis and came to grief.
You will learn more and more about diabetes and how to tackle problems related to diabetes and you will feel more and more confident and not worry about things like food at Christmas or social functions, etc
The most important thing is that you stay healthy and complication free for as long as you possibly can, and if there are times when you feel really deprived of some foods then go and replace the craving with something else you would enjoy, like a CD, concert/gig ticket, book or whatever, this might well work, it did for me, but to be honest not all of the time, well I am only human. And as I said before recipes can be adapted so you still have treats and gradually you will get used to things and not miss what you had before.
All the best
Karen