Hi Janniebug,
Yes, that happened to me last week. My wife was out and I had a night with the single malt. It was fun for a couple of hours. Next day? Hungover - ouch.
But, you know, For a long time now I have been so glad of the straight days. Maybe old habits can actually fade out. I know that AA don't say that, but over a period of a couple of years I have gradually moved over from heavy drinker to occasional drinker. The evidence is in the units, and I don't have to count them any more.
It can happen.
Good luck, Myzen.