The speaker of "stomach ache" doesn't want to start the day, and the poem is built around that single refusal. It opens and closes with the same line, "i dont want to wake up," so the poem feels like a loop the speaker can't escape. In between, waking is described as a chain of things that go wrong: thinking leads to staying up, opening your eyes leads to getting lost, and drying your tears leads to being locked in.
The second stanza turns to the advice people usually give. "Stay positive" and "be self aware" sound helpful, but here they end in "look up" and "give up," as if even trying to cope leads to exhaustion. The quiet line "I just want to go back..." suggests a wish to return to sleep, or perhaps to somewhere safer, though the poem never says where.
The mood is tired, heavy and sad. Short lines, simple rhymes and the lowercase, unpolished style make it sound like a private thought. The title suggests the feeling is physical as well as emotional, a dread that sits in the body.