Get. Out. Now. Plain and simple.
It's not just the horrible things he said, though that's inexcusable. It's not just that he said it in front of the kids. That amazingly bad parenting. It's not just the alcohol. All though, he's clearly a man on the edge.
It's all of those things combined. The man has serious issues.
By staying with him you are enabling him to keep functioning as an alcoholic. You are in effect helping him to maintian his life, despite his unwillingness to stick to treatment.
By staying with him, you are submitting yourself to verbal abuse. I'm not not familiar with your posts (I'm sorry) but I'm willing to bet this isn't the first time and I'm really sure it won't be the last.
Worst of all, you are showing your daughters that it is exceptable behavior from a spouse. Is this the model you want them to follow? (would you want your daughter to marry a man that has your husband's issues?) Please think about this. The damage thats being inflicted on your daughters can last a lifetime. Your daughters are already genetically predisposed to be alcoholics, do you want them to be emotionally predisposed as well? Do you want them to unconsciously gravitate to men that are like their father because that's all they know?
I'm sorry I know this post comes across as kind of harsh. But I honestly, am worried about you and your daughters. I've seen too many of my adult friends deal with the after effects of life with an alcoholic parent. Even now your daughters will need help dealing with this - what happens in another year, five years?