Trist - sorry you have a poorly baby on your hands.
Ah, the little voice that tells you when you stopped, you over-reacted, you don't have a drink problem or abuse alcohol, you can a glass or tow, can't you?
Well, of course you can. But will it be no more than two? Or will you have to finish the bottle? And then open another.
You're not alone, I too got that voice and even DH was unsupportive at first. The whole - 'you're not an alcoholic, you just drink too much and pass out' 
Yes, I admit I am in more control of my drinking now that I have ever been at any stage in my life but I know, that if I wobble (and I do) I'll be that bottle + a night Mouse again in no time at all.
The fact that you are exhausted won't help you either, you just want to relaxe and reward your hard work today looking after a poorly DC with a nice glass of wine.
But why undo your week of amazing control? Why go back to the start willingly?
Plus, you will feel physically worse than any hangover you've had of late because you've not had a drink for a week. Your body will rebel and you'll feel like Deep Fried Dog Vomit 
Has anything triggered you wanting/thinking about a drink sweets? Is it because you're knackered do you think?