The poem sets two opposite temperatures against each other, and the speaker is caught between them. In the first lines, the speaker is "in the oven," trapped in unbearable heat and "a whole month hungry." The title, "Heat wave," fits: it feels like a summer that won't let up, wearing the body down until all that's left is craving.
Then the poem swerves. The speaker hunts "a new country under the ice / on my right eye." That's a strange, dreamlike image. It could be a cooling fantasy, a wish for somewhere else, somewhere cold and clean. The ice on one eye might suggest a compress held against it, or a kind of blurred, half-blind vision, though the poem doesn't say which.
The mood is feverish and restless. The speaker is uncomfortable and longing, and the hunger seems to be for more than food: for escape, relief, a different world. The short lines make the poem feel tight and breathless, like the heat itself.