Welcome dig! I too was a "functional alcoholic" now I'm just a recovering one.
You sound like me only about 3 years ago when I was drinking 2 to 3 drinks on weeknights and then going nuts on the weekends.
You're in the right place here! People are very helpful and supportive here. And I agree with the others. Tell your wife. She probably already deep down knows it and she might actually be relieved to here it come out.
Itchy here once told me that the more tools you have in your toolbox, the better off you are. Many times our family members are a pretty strong asset. (I know my hubby and son are!)