It reminds me, in fact, of a scene from the movie Labyrinth (which happens to be my favorite movie of all time and which I have seen an obscene number of times).
Sarah has just entered the labyrinth and is confronted with a long passage that goes on as far as the eye can see. At first she walks and then starts to run down this passage. But after a while she gives up, exhausted and frustrated because it seems that, as she says, "There aren't any turns or any openings or anything! It just goes on and on!"
Luckily for her, a little worm shows her how to see the passage differently and it suddenly "clicks" for her and her adventure starts to "flow."
"Things are not always what they seem in this place."
Sarah will still encounter challenges as she makes her way through the labyrinth, but from that moment on she never gets stuck like she was in the beginning.
So my creative process is a lot like that: exhausting myself trying to find that different way of seeing or that magic key that will make everything click into place. Except in my case there's no friendly little worm to show me the way. I have to figure it out for myself.