For me, trying to fight the block just makes it worse, sometimes making me really frustrated. So I take some time off the project, maybe work on something else or take a short break from game dev as a whole.
I feel that. It's like the brain gets clogged and nothing can manifest. It's a constant threat that looms in the background. But taking some time-off is sound advice. Take a walk, exercise, cook, clean, listen to music, dance-anything! In order to direct attention away from what your brain is constantly clamoring for.
TLDR: Make your intention clear.