You don't have to make any decisions now. It may be months - or you may decide to live separate and not divorce.
I'm sorry he will continue to drink. When my husband was diagnosed he did as well. That is why he ended up the way he ended up. Thing is some A's scoot through life and amazingly avoid repercussions we think will happen - they maintain jobs, they avoid being fired when they should, they drive drunk and don't get caught etc.
This is not something he will avoid. He may manage to go for awhile, but the pancreatitis is going to come back. It was the illness that brought my husband to his knees and to sobriety. He couldn't beat it. Its a dangerous and painful path. Perhaps your husband will reach his bottom this way - as scary as it sounds you must leave him to his own devices for your own sanity and hope that he will decide its no way to live.
((((hugs))))