The medication explanation is a good one. Thought about using it myself! But I've also used, "Well I'm just trying to cut back. Better myself." Usually ends right there. I'm more concerned about the mind tricks and uncomfortableness. I've learned it does pass though.
One thought for today is that your not missing out on anything. I've always felt I was missing out on something if I wasn't drinking on the weekends, holidays, or social event. When in truth I WAS missing out entirely BY drinking. Crazy thinkin there.