An idea that might be foreign to people who write in text editors.
You can use an outliner to write multiple documents.
Try creating a headline called My Diary.
Then every day, add a subhead with the day's date.
Do it for a few days until the strangeness wears off.
Does this make sense?
Here's a screen shot of my "worknotes" diary, which is one level deeper.
You can think of every major head under a day as a separate document.
In fact the CMS sees it that way. So I have one document which in turn contains many documents. Actually thousands!
For many people this will be a new way of thinking about writing.