Oh yes, I can fully identify. Like waking up before the end of a dream and not being able to grasp it or its ending! You have expressed succinctly and clearly the frustration, and yet the resolution of the writer. Good wishes for the contest.
What a fascinating tale of creativity in your poem. That's how we feel when we have writer's block. You have an idea, put the idea on paper and then the idea has disappeared. But it will come back if you give it time and thought again.
I feel very sorry for you, as your creative process seems to be doomed to total failure more often than not. It is bad enough when the quality doesn't reach the heights we hope for, but zero production, that's tragic.
You've captured the creative process well here in this jaunty rhyme. I liked the use of 'Fanstorical glory'. Then drat, the curse of the creative writer strikes - your idea has slipped away through that door.
adjust the dash to a hyphen here: Where non - ideas go (non-ideas)