Thanks op & @sparklinglime sorry you're dealing with an alcoholic in your life too.
I don't have a great relationship with my dad and yet I still pity what he is going through every day.
Not least because I know he is ordinarily quite a stoic person so for him to show the pain he is in means it must be AGONY.
PLEASE don't attempt to quit cold turkey with no support. Not only is it potentially dangerous (you've said how much you drink but not your body size, which makes a big difference to how it all affects you) but in all likelihood you'll feel like shit, have a drink and you'll feel better and this will make you much less inclined to quit.
There are medications and guidance your dr will be aware of that can be used to help with withdrawal etc
My dad is not the only alcoholic I know I know fat too many, it's so common.
The ones that have succeeded in quitting - and staying off it - have not done it alone. Different things suit different people, some have done it with support from nhs, some AA, some other alcohol support groups, some religious support groups, some with eastern philosophies and support groups (meditation etc) most use a combination to be honest.
Those that tried to do it alone were not successful. It's such a difficult addiction to overcome not least because the substance is legal, cheap and easily available but also because it's a physical as well as a psychological addiction and your brain chemistry will have been changed by your use of alcohol.
Be aware also that simply not drinking doesn't mean you're healthy, physically or psychologically. There's "dry drunk" and the physical effects can be permanent - but of course it's best to stop as soon as you can to prevent further damage.
I am more thank happy to talk by pm if you wish, if not please continue to post and work through everything.
I've never been a big drinker, I've also never even tried a cigarette let alone harder drugs and gambling wise I don't even do the lottery as I firmly believe based on my experiences in life and with my family that addiction is something we have a genetic predisposition to and research now appears to confirm.
I've still got ocd which feeds into the obsessive side of things and I get very involved in things if I'm not careful. Eg I'm overweight not totally due to food addiction I don't think but more when I try and lose weight I have to be very careful not to slip into disordered thinking, I've also been addicted to exercise in the past.
Addicts brains don't work the same as others I believe. Much more research is needed.
Please make appointment with gp asap.