We've said that based upon your posts mate, because we're worried about you. We've also suggested lots of ideas, and also that it's not the end of the world being on your own for a bit. No harm in either embracing the me-time, or seeing the opportunity to expand your friend circle.
There is harm is sitting there talking in the way you have so far, letting your ex roll all over you and then thinking that Xmas will be awful if you're on your own.
We're often told these days that we shouldn't simply say "Oh well, never mind, you'll get over it, cheer up" to folks who may have genuine mental health concerns. We're told by the experts to recommend that they see somebody for help, and sooner rather than later. That's what the vast majority of people have done in here.