Wicked, how old and how many are your DC? Do you get any breaks and/or any help? I cannot seem to find the right words this morning, but the gist of what I am trying to say is... I began my bad drinking habits as a way of managing the domestic pressure of too many children too close together plus absent-minded workaholic DH plus WOH myself. I never found the voice to say, "Help!" and ploughed on for years depressed and drinking.
Christmas is an acutely bad time for domestic overload. Duh. Reminds me of a conversation with my GP when I was seeing him regularly for PND years ago. He asked me whether I was looking forward to Christmas, asking it as if it really was a postive event on the horizon. I remember thinking he was out of his mind, of course I wasn't looking forward to Christmas as the expectations and workload were huge. It was another great hurdle to jump.
So, Wicked, who can you talk to? Counsellor, friend, DH? Can you drop a few events? Simplify the DC's bedtime routine? Can you carve out some time for yourself?
"My mood with the kids is still horrible though - I am not sure if I am just a horrible person regardless of alcohol".
No, no, no. You are NOT horrible. 