i'm so sorry to read this.
i guess he is also driving against doctor's advice, to obtain booze.
i agree, stop living to save his sorry ungrateful assss. start living for you, your great dogs, and beeyootiful granddaughter.
if you can put him and his crap behavior in the background noise for now.
thing is, he forced your hand and did what you said you would not tolerate....so he thinks you have no real boundary...so he may think he's ok to keep drinking, you aren't leaving, you're still there taking care of things.
if he is drinking and driving again...you can't ignore it, cos he might not be so lucky and will cause harm to others. can you untangle him from your car insurance?