Please keep the appointment, if you can't get one sooner by saying it's an emergency.
I'm another who had a problem with alcohol, and whilst I do understand your reluctance to speak to a GP, it is important that you do it. I was reluctant too, and very ashamed, but he was understanding and kind. I was referred for tests and it turned out that I had damaged my liver, but I stopped drinking and 5 years later I feel so much better than I did then, even allowing for the damage. Once you have spoken to the GP, you have admitted that there is a problem. It's great that you have told us on here, but telling a real person is a watershed. The genie is out of the bottle then.
I wasn't drinking quite as much as you, but I'd been doing it for a long time, and I did manage to stop on my own. The fact that I had liver damage was enough to scare me into stopping, and the truth is that it was so much easier than I'd thought it would be. Really. I used hypnosis tracks (Craig Beck is good). Whether the hypnosis worked or not, they gave a routine to bedtime, as going to bed sober was a novelty. I swapped wine for the fake stuff, and always drank it chilled in a wine glass, as though it was the real thing. It takes a bit of getting used to (ok it's grim, although the fake fizz is better than the flat), but it helped a lot with the habit side of things. It is doable, I promise.
But the first step is to speak to the GP and get your LFTs done, and an ultrasound to see if there is damage. I wasn't given any medication, but obviously that depends on the extent of the scarring if you have any, and if you need help to stop drinking or diuretics for any water retention, the sooner you get it the better. You should take high dose Vitamin B1 (thiamine) to prevent brain damage which can occur if you stop drinking suddenly. Get that now, as it can prevent damage but not cure it. Avoid any other drugs or supplements until you have spoken to a doctor.
Good luck, and keep posting. You can do it.