Anyone else struggle with the urge to go back and start editing / checking something you’ve recently written? When I open the document to begin writing again, I find that I have a tendancy to go back a few pages or so, re-reading to get myself into the flow…but then I find that I begin tweaking and changing and twiddling things whilst I’m there!
If you read any of the advice on the NaNo website, they advocate writing, writing and more writing -Editing is the enemy! 🙂 And I know that’s true, because my writing certainly flows differently if I’m not at all in the editing mode.
So, that is why today’s inspirational kick in the booty is this: “First drafts don’t have to be perfect. They just have to be written.” Now, all I have to do is actually listen the advice I’m giving myself.
Mel Cusick-Jones 
I try not to over edit when I’m working on a first draft, but I always have to go back a page or two…as you said, just to get into the flow of it again. If I think something major needs adding, I’ll drop a note in there in bold and come back to it when I’ve finished the draft.