The speaker is trying to describe a feeling that won't sit still, so they keep reaching for comparisons: blurred glass, a bottomless fall, an empty street. Each one captures the same helplessness. Everything is close enough to see but impossible to touch. The image of being surrounded by water yet feeling "so infuriatingly dry" sums it up well. Something is all around them, and none of it satisfies.
The dream image pushes this further. It holds "all the stars and moons of the cosmos" and "the blankness of an empty canvas" at once, so the world seems full and empty together. The repeated "want, want, want" stands out because the lines before it are long and the words here are so bare. It reads like a plea, or a loop the speaker can't escape. The ending adds a final sting: while everything else rises, the speaker is dragged down. The mood is restless, longing and quietly desperate, with a sense of being left behind.