Well I slept much better last night, after being wide awake most of the night before. Feeling that I am already seeing some benefits, both mentally (less brain fog) and physically (brighter eyes, skin looks a bit better).
I didn't find it toooo difficult not having a drink last night. After DJ I'd like to be able to drink only when we go out - usually (in normal times) for a meal once a week, and to the pub once a week - and to train myself not to drink at home at all, because that really is the slippery slope for me, and I've been much worse during lockdown.
I've been taking CBD oil and that definitely makes me feel a bit more chilled. I'll monitor this and report back.
@SilverRing I do feel for you. My DH is a regular but annoyingly moderate drinker and he would never do DJ, he doesn't see the point and it would make him miserable. He has regular nights AF, and will sometimes sit nursing one glass of red wine or whisky all night - or he might drink a whole bottle of wine! I have far less of an off switch than him, and once I've started I'm always itching for more, and then have to deploy a lot of willpower, which is, frankly, exhausting. I'm really enjoying the simplicity of just knowing that I can't drink! DH will say things like, "why don't you just have one glass of wine?" because he doesn't get how hard that is for me - I would usually have at least two, most nights of the week. The saving grace for me is that I don't drink the same things as him - I like white wine and fizz - so his continuing to drink during DJ doesn't really bother me. If he cracked open a Chablis, that would be really tricky 
. It would also be difficult if we were going out - I know he would feel weird without his drinking buddy in a pub or restaurant (and I'd be struggling as well), so I am relieved that this isn't an option.
Perhaps you could just frame this to yourself as a time-limited situation? Also, it's only Day 3 and you are adapting and detoxing. It may be easier in a few days' time. Good luck and hang in there!