Pulling Teeth

So I am working on this painting, and have been for a while, off and on since May. It keeps changing, never seems to work. The total surface is now completely different than what I started with. Still it doesn't seem to work. What is it with this canvas - I feel like it's cursed. What should I do with it - keep fighting it or set it aside and not look at it for a couple months? At this this point it is totally undermining my confidence. It's like the writer's block of the art world. Fourth of July was a nice diversion, and hooray for all the rain we have been getting. Also I've been picking cherries and freezing them.