A quick fix when your problem is you and how you're feeling. This works especially if you're feeling slow and lethargic, it's good if you're feeling in any way too below par to get any work done.
Go see somebody.
I don't mean a doctor. I mean arrange to get a lunch or a coffee with someone now.
It may well be that what you ought to be doing is staying right where you are and getting this bastard piece of work done, but the odds are good that you would just continue pushing the pieces around without getting anywhere. And the odds are high that whatever you do accomplish will be about as below par as you.
So if the hour or the day is not going to work out, spend that time or a key part of it going to have a coffee with someone.
Because it does three things.
The obvious first one is that coffee will perk you up, you use a percolator to perk you up now.
But there is also the business of who you go to see. There's the issue of whether they can see you, but before you pick up that phone you need to have thought of someone to call and you need to have an idea of what to call them about. Maybe you can just phone them with the idea of getting a coffee; I tend to need something more to offer them, like it's a coffee about doing this or it's a tea about doing that. Whatever it is, you have to pick the person and you have to think of what you'll say and you have to phone them.
And you'll then have to do that with the next person if your first choice can't make it.
Then when you do meet them, though, that's when the third and by far the biggest boost comes. This works with anyone you meet, anyone at all. But it's greater if it's someone you like. Greater still if it's someone you in any way admire. It is beyond measure greater if you also fancy them.
Whoever they are and whatever you think of the way they flick their hair, you will be performing for them.
There is just no possibility that you will present yourself as this half-dead sloth who could barely type a word. You will bounce. You will lie.
And the lying and the performance will pick you up.
Then get back to work as quickly as you can before it all fades.