It's said the relapse happens before the drinking starts. In your previous post you wrote:
Originally Posted by
anxiousrock 
I have 5 days off work coming up....temptation will be horrendously strong as I've been bored and having bad anxiety.
You were setting yourself up to drink. You didn't make a plan for the five days off, didn't post before you drank. You made the decision to drink, and did. You see how the addiction works. You can't let yourself be taken off guard. Make this next run at it lasting sobriety.