The speaker is trying to get away from something painful, and every verb shows a different way of doing it. First they spin, hoping to shake the memories out of their head. Then they run, as if they could leave their life behind. Then they fall, half-hoping something will catch them and bounce them back up. Each stanza repeats "faster and faster," so the panic builds.
The last stanza changes direction. The speed gives way to "slower and slower" breathing, and the speaker seems worn out, as if the world is too much to take in. The poem ends on falling into a "never ending sleep," which could suggest deep exhaustion or something darker, like a wish to disappear. The poem doesn't say which, and that uncertainty adds to its weight.
The mood is restless, then heavy and tired. The repetition feels like a loop the speaker can't break, until the energy simply drains away.