Well geez, I logged in today for the first time in months because I was feeling this feeling and wanted some wisdom. Here's an old post of mine revived from 2013!
I'm having my annual holiday blues, less severe than it used to be, but it's still a drag. Lately I have just plain been missing my XAH. There is no reason to it, and certainly no logic to it (he is exactly where I left him, unemployed, living in his parents' basement, still a drunk), but I miss him down to my bones.
It is what it is. I have a good job, a boyfriend who is sweet to me and my children, and two happy and healthy kids. I don't know what this feeling is about, it's just there. I just felt the need to say it to somebody.
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When it comes to the Xmas blues, I have found that creating new traditions with my kids, cooking a ton, getting together with my friends, letting go of any expectations around my FOO, and buying myself any damn thing I want for any holiday has been a good method of dealing with the sadness.