Firstly OP, you are not at rock bottom. Not by a long way. Several weeks ago my sister was found collapsed by her neighbour. She was living in squalor, malnourished with muscle wastage and severe ascites (fluid around her abdomen). She spent three weeks in hospital. She has acute end stage liver failure. She lives alone, having pushed family and everyone else away. She now has to have people in to help her shower etc as she can hardly walk. The odds at this stage are poor and stacked heavily against her. She has mental confusion and it has taken its toll on her mental health. She may well stop drinking but by now it is too late. The chemical changes in the brain will make it difficult at this stage for her to stop.
You sound a long way from her position, thankfully. Don't be so hard on yourself. It's very common to drink too much once in a while. If this is a one off, then it's not a huge issue. But it's definitely worth implementing a rule that you don't drink if you are feeling sad/frustrated etc. If you are concerned about your drinking generally, there are some great books on Amazon. Once you understand how alcohol works, you will most likely want to steer clear of the stuff. It's sadly almost certainly too late for my sister. She will now have to have fluid continuosly drained from her abdomen, will need injections to help her blood clot, will need regularly and highly unpleasant cameras down her throat to check for varices caused by high blood pressure in the stomach. If these burst she could bleed to death. She needs intensive physio. If she's lucky and gets her mental health sorted, gives up alcohol and sticks to a very low salt bland diet, then there is a chance that she could get on a transplant list.
The trouble with alcohol is that it effects people differently and at different ages too. So one person might drink heavily but their age, pattern of drinking (whether they drink more slowly and with food), their sex and if female, their estrogen levels, all make a difference. And sometimes there is no reason why one person will develop end stage liver failure and another won't after a prolonged phase (usually ten or more years of drinking too much). It's a gamble.
You',re right to be concerned about the impact of alcohol, but don't beat yourself up. Be proactive and move on in a more positive way.