Ledkr < what you just said. Whatever programme you enjoy watching Ophelia, just watch it. Doesn't matter if you have to watch it 5 times over because your mind wanders, just keep doing it.
Whatever you feel, or whatever thoughts you have are completely normal. Tuck yourself up in a blanket and watch TV all night if you want. Sleep will come when it needs to. For the DTs? Well, they'll know something's up but they are too young to remember any details, so don't fret about that. As long as you love them and keep as much normality as you can, they'll be fine and probably won't even notice that the twat's missing for a while. They're young! How many of us can remember being ... 2? 3? 4?. Not really.
If you want to eat comfort food, or crisps, or salad, all day, then do it. Do what's good for YOU right now and sort out any residual matter later.
People DO follow a pattern, so all the advice on this thread is spot on, because many people have been in the same situation a few times over and the same pattern emerges (although your situation is quite extreme, to be fair). No-one can tell you what to do - only you can do that. All we can do is offer advice from our perspective and hope that it makes it easier for you.
You need to do what's best for you - not anyone else. Only you know what that is.