I'm sorry you've got this to deal with, FS--it IS really so sad. He knows he chose it, and it sounds like he had some illusions about having control, not necessarily of the drinking but of the consequences of it. Now the chickens are coming home to roost and it's got to be terrifying...I can't imagine how awful it must be.
I really fear something like this for my XAH; however, he does not and will never have the money for assisted living/caregivers, so his options will be even more limited.