Hi Karen and welcome. Sounds like classic alcoholic behavior to me. You can't fix him though. He has to want to do it for himself. If you try to help or suggest it will just fall on deaf ears.
As for kids, you could freeze eggs. And older women than you are having babies. I had mine at 40 and 43. But my AH was and still is drinking so you are right about being concerned bringing kids into the mix. Do you want to be married to him but raising your children as if you were a single parent? That has been my experience.
I can't give answer, just my own experience. And support. It is tough. My thought are with you.