Just to tell you...ANY DIVORCE HURTS. OK?? that is normal. It is the death of something we believed in. You would be hurting, even if he never drank a drop in his life. And yes, holidays make it worse.
The drinking being part of it, is simply icing on the cake, because we know the harm it causes. Having a valid reason for ending the marriage, does not mean it is gonna be easy.
You WILL GET THROUGH. I don't know how long, or how...but I promise it will get easier.