Sounds like you have already zeroed in on the two most important things : you realized from the beginning you drink a certain way( that isn't going to change for the better only worse) and you can come out of day 13 with your backside intact.
I think you incorrectly identified the cause of the heartbrake, it wasn't anything she had done it was your drinking, the fact of it , yeah ?
Decide to put the bottle down for good, no more no matter what, Yeah ?
and on the fourteenth day , decide to see it as the 13 th , leave the drink behind you in the past , nobody will be happier about it than yourself, I guarantee rootin for ya