Mansfield's poem is about being stuck in a mind you can't escape, and about the strain of being asked to explain that to other people. The speaker is questioned about "you" and about themselves, and gives the same kind of answer both times: you are trapped inside your own mind, and so am I. The "you" may be another person, though the later lines, where the speaker tells themselves to ask "yourself," suggest it could also be a divided self.
The feeling is confusion and desperation. The speaker is "floating on a cloud," yet also "a trapped dog trying to get out," and the two images pull against each other: numb and drifting on one hand, panicked and caged on the other. Vision is "clouded," home can't be found, and the cry "Oh Christ what do we do" comes back like a prayer with no reply. The repeated lines make the poem feel circular, as if the speaker keeps walking the same loop. The mood is anxious, weary, and quietly pleading for help.