Hi whiskeyjoe - welcome
When I got sober I told everyone - I would have told the milkman...
that worked for me because I had no workmates and I needed to tell my friends - they were my drinking buddies and I needed to make a definitive statement.
But workplaces do need some thought - and only you know your workplace.
If you're sick and tired of giving excuses then really all you need to do is not give excuses anymore.
Just say you're not drinking anymore. You've decided to be a non drinker.
You may *feel* the need to explain but I really don't think it's required. You don't need to add anymore to that, I don't think - if you do tho, you could always say you haven't drunk for awhile...and you like it
D