There are many ways to kill creativity. But one of the most effective I've found so far is negative stress, especially when it is brought on by financial issues.
If your brain is consumed by worries about how you'll pay the electric (so the computer keeps working), never mind the cost of food, it tends to provide real distraction from the essentials: e.g. working out the new shape of the story you're rewriting.
"Suck it up! It's part of the screenwriting journey you wuss!"
Thanks for the pep-talk brain! It really helped. ...
*gnashes teeth* *grumbles* *bashes head into wall repeatedly* *gnashes teeth again*