What I've learned is that it's useless to promisse never drink again, mainly when in a hangover after a night of drunkenness (even in a physical, moral and existencial hangover).
The truth is that you will not be the same tomorrow in another situation, mind state or environment. There will be a situation that to drink will seem a good idea, or you will think you can control, or that you deserve, or that it's the last time (tomorrow you will seriously begin...) or bla bla bla.
A thing that once I thought could help would be try never forget the extremely embarrassing things that I done when I was drunk.
Maybe a steemit account to dayly write (anonymously) about those embarrassments would be a good idea.
I am not a native English speaker, so if you are a English speaker you can help me. Feel free to point my erros. And also help-me improve this text.