If given the opportunity to make a movie (any movie, any genre, even almost any budget) the LAST thing I would do is make a movie with a writer as a central character.  Movies are visual. Writing isn't.  It's mental (and many would argue you have to be "mental" to do it, but I digress...)

Point being: NOTHING happens, really: a solitary person (yes, inevitably, even in TV script-writing, a solitary individual  has to leave the boardroom and the "writing committee" and put stuff on a screen, and, later, paper) typing away or stroking through a printed manuscript with a pencil. That's it.  Nothing more to see.  

Very occasionally, a movie about a writer (or, events or circumstances involving a writer) rises above.  "Trumbo" comes to mind. But then--at least in the movie, quite possibly in real-life--Dalton Trumbo was somewhat larger-than-life. Quirky, at the very least.  Yes; that'll work. A would-be writer suffering from PTSD? Not so much.  Regardless of WHAT he ended up writing.