I am so sorry to hear this OP. You desperately need some RL support, do you have any family or friends that you can absolutely trust, if so please talk to them about this. You also need to see your GP about this, or at least have a phone appointment with them if they are only seeing emergencies. Some people would not think that that much alcohol a day is too bad, but as I am sure you know, it is certainly more than the 14 units a week that we are supposed have as a maximum.
I am no expert on this, so I do hope you get some replys from people who really know what they are talking about. I know that the liver needs rests from processing alcohol, so if at first you could manage one or two evenings a week without any alcohol, that would be great. However if you are living alone, and especially if you are WFH at the moment as well, it is understandable that you use alcohol to help you feel relaxed, and less stressed for a while. Hopefully your GP can come up with other methods to relax and de-stress yourself. I can only think of the obvious ones, such as going for a walk in the daylight in somewhere as pretty as possible. If you are not near the countryside, do you have a nice park that you can wrap up warmly and go for a walk in, that should give you both fresh air, and some exercise. If you like reading and have a garden, or access to a communal one, again wrap up very warmly, take a blanket into the garden with you, and an insulated mug with your favourite hot drink in it, and just sit in the garden, reading your book, but 20 - 30 minutes would be long enough, I don't want you freezing to death!
You don't sound as if you are an alcoholic (again I only know anything about being an alcoholic from seeing it on TV, or reading articles about it), but my understanding of being an alcoholic is that they wake up in the morning craving an alcoholic drink, and that they rarely get noticeably drunk because their bodies are so used to the alcohol that it doesn't really show, and everyone is so used to their behaviour under the influence of alcohol, that it takes some kind of change in routine for it to show up. Having said that, I believe that an alcoholic cannot function in the same way as others can, and some are very obviously drunk all the time.
Are you not only worried about how much you are drinking at the moment, but afraid you will start drinking more and more.
Again, I come back to the thought that you need support from a loved one, and support from your GP.
The only other thing I can think of at the moment is that (I hope this doesn't sound condescending) is how great it is that you have realised that what you are doing is not healthy - either for your mind or your body, and I am sure that your self-awareness, and desire to be more healthy and/or less dependant on alcohol, will help you greatly with your motivation to cut down your alcohol consumption.
Your GP, or a mumsnetter may hopefully be able to give you a sort of step by step approach on how to start cutting down on your drinking, all I can say is please be kind to yourself, and try to plan little treats for yourself, I am sending you a big hug. xx