I had a whole journal full of notes & promises I wrote myself. But I never left. Why? Because that wasn't what I really wanted. What I really wanted was for him to just stop drinking. I feel your pain and frustration.
I really recommend you try Al-Anon - it helped me to put everything into perspective. I went from telling myself 'I can't live like this anymore' to 'I will be fine whether he's drinking or not.'