Well, think about it like smoking cigarettes...they say ever cigarette takes how many seconds/minutes off your life, on average????
Every nosedive off the DB wagon likewise results in a few more hours/days/weeks we most likely add on to getting past things. But just like the occasional cigarette, if you don't make a habit of it, it probably won't kill the R for good. But each time makes it easier to do it again.
Nothing to do but apologize and move on. What you did didn't help you, but it is certainly forgiveable.
But don't do it again.
You keep using that word. I do not think it means what you think it means. -- Inigo Montoya, 'The Princess Bride'