Someone is in pain and doesn't know why. The speaker describes chest pains that keep them awake at night, and they've been getting worse for two weeks. What stands out is the reassurance they've been given. "They say it's normal," but the speaker doesn't buy it. The question "do they really know / Or are they, just guessing?" shows a person who feels brushed off and left alone with their worry.
The mood is anxious and uneasy. The lines are short and broken, with pauses and dashes, which makes the poem sound like thoughts racing in the dark when sleep won't come. The poem ends on two questions, "Will it ever stop? / Or will it only get worse?", and gives no answer. That open ending leaves the reader in the same uncertainty as the speaker. The title "Batman" is puzzling, and the poem doesn't explain it. It may be a pen name or a playful mask, but we can't tell from the text alone.