This does sound like a dependency. I grew up the daughter of an alcoholic and am now the sister of another, so I know the extent to which this substance can blight your life.
I know I have a propensity toward weekend binge-drinking too. 2 bottles of wine adds up to about 18 units, so these days I ensure I don't drink every Friday and Saturday night as I used to, and restrict my intake to a bottle per weekend across both nights (bottle and a half absolute maximum).
I was up to 3-4 bottles a week after my mother died, and this had me worried. I knew if I carried on the way I was going I'd end up an alcoholic, so I binned the drink for several months before taking it up again with a great deal more care. My sibling, on the other hand, progressed into a serious physical addiction and I now live my life in dread of 'that' phone call.
Sometimes I wonder why I bother to drink at all. I'm always morbidly conscious of what I'm drinking, and I watch my own behaviour like a hawk. And yes, given the negative points I do wonder why I do it at all. I managed fine without when pregnant and breastfeeding, and perhaps given my family background I should nix it for once and all. But I do know it isn't any too easy to give up.
You do, absolutely, need to scale it back. I was once where you are now - pretty much exactly where - and I've done it. But I can tell you this much: you'll have to keep a close eye on it for life. Habits like this have an unfortunate habit of creeping back. I'm asking myself (yet again) if it's really worth it.
Good luck.