Hi MoP - don't presume to be any kind of expert on mental health so can only comment based on my own experience of depression. The wording of your post does sound a bit like the way that I think when I am mildly depressed - both the "I'm a fraud bit" and the self-criticism underlying the phrase "me,me,me". In my case I think that I drink because I'm depressed (I suffered from depression before I started drinking a lot, and don't think the drinking made me more depressed), however alcohol is widely recognised as a depressant and I know many people find that for them it's the other way around.
As you'll see from earlier up the thread, during the first four weeks of cutting back drinking I felt as if I'd been hit by a bus in terms of physical exhaustion. In fact I still feel pretty down and tired. I've googled it a fair bit (after feeling sorry for myself yesterday), this is not terribly unusual and apparently it can take a couple of months before things pick up.
whatever the case, I think you'll agree that alcohol is part of the problem and not the solution, that you don't want to have to repeat the last few days, and the only way forward is on and up! New jobs are always a challenge, but that can be exciting as well as scary, and sounds as though your family are excited and behind you!
Change the sheets, have a hot shower and put on some fresh pjs! Will make you feel much better and like you're having a fresh start to the day, even if it's evening time. I find fennel tea is a great pick me up when depressed (although that may be psychological). Fennel tea with toast and vegemite is the best. But if you're not a vegemite / marmite girl, a healthy dose of B vitamins (perhaps not liver. Have just recalled that a a child my mother used to dose me with brewers yeast powder. Urghh. It was disgusting).
Also - and this is very much a personal preference, I find that listening to the radio in a dimly lit room helps.
Good luck for tomorrow! (but sure you don't need it..). And hugs and sympathy and stuff - everyone else is much better at these than me and they will be along in due course.......