You have something on your mind, and you are in a flurry. The popular reading "The Duke of Zhou" says that it is expensive and rich, which doesn't make sense in theory, nor does the psychology of China people. In Tang Ben's Duke of Zhou, the snake represents evil. So I think the dream snake must be based on the usual understanding of snakes, so snakes symbolize an evil force.
In dreams, killing a snake is often very hard, but in real life, nothing has been realized, mainly because I am very uneasy. Just take care of your heart.