Writer's block is real. It happens. Some days you sit down at the old typewriter, put your fingers on the keys, and nothing pops into your head. Blanko. Nada. El nothingissimo. What you do when this happens is what separates you from the one-of-these...
For some it is harder to write a novel than to row a bathtub across the North Atlantic.
Novel writing is like heroin addiction; it takes everything you've got.