The speaker starts out with a restless mind. Water rushes past, but their thoughts move even faster, and the line "Disturbing my mind" suggests they feel unsettled, maybe overwhelmed. The word "They" is a little unclear, since it seems to refer to the water, but the grammar slips there, which fits the feeling of thoughts tumbling over each other.
Then things shift. Birds sing sweetly and loudly enough to make the speaker look up, and what they see is an orange sunset that "made my day." The light falls on both the speaker and the world, so they feel connected to everything around them rather than trapped inside their own head. The ending carries the lesson: the sunset seems to tell them to let everything go, "as it goes," the way the day itself fades.
The mood moves from anxious and crowded to calm, warm and quietly hopeful. It's a simple, personal poem about how a small moment in nature can loosen a heavy mind.