Hi. I don't know when your surgery is booked but I would suggest that you start weaning off of the alcohol preop. As a medical professional who worked surgery for years I can tell you that 3-4 glasses of wine a night is enough to put you into alcohol withdrawl if you go 3 days without a drink ,and that would be a very serious problem for surgery.
I also think that you should tell the OCC how much you have been drinking so that they are fully prepared and that you will have the safest surgical outcome.
I hope you do not find this offensive in anyway , I am just hoping to give you some helpful information.