It’s just like, suddenly, a volcano erupts. Words flow into my mind, demanding to be put down. All is seen and heard, and the path ahead is clear. Focus and concentration swell like a romantic song, and the urge to write is a fire. An internal little engine begins chugging, I must do it, I must do it, I must write, I must get it done. And, yeah, the mixed metaphors are appropriate to convey the complexities.
Time to write like crazy, at least one more time.