Hi Jen,
A lot of the folks here have written some very good advice- I am in the same situation and can commiserate... alone today and tomorrow. :( Soon-to-be-ex-husband off celebrating X-mas with his family, the only family I have ever celebrated x-mas with. I feel ya!
I think that it is good to get out and interact with some people! That is what I am going to try to do today. Go on a walk, go to the park, even if you are cold- I did it yesterday and it made me feel a whole lot better.
We are all rooting for you!
-Kudra