By high functioning you mean you sit in the corner getting drunk every evening whilst ignoring your wife and kids? Fighting with them on a regular basis because you're sozzled?
Since then hasn't touched a drop and I've got a father in law. My children have got a grandpa.
He deeply regrets the time he missed with his kids, but luckily has been able to spend a lot of time with his grandchildren.
I understand where it comes from - kids are hard work and you need a coping mechanism to survive the first couple of years. Yours is alcohol, mine is sweet food (so I'm too fat), others smoke.... maybe we should try collecting stamps instead? :)