What is the correct response to feeling dizzy after a nuclear explosion?

Seeking medical attention is the appropriate response to feeling dizzy after a nuclear explosion due to the potential for serious health risks associated with radiation exposure. Dizziness can be a symptom of radiation sickness or other complications that may arise from being in a contaminated environment. Receiving prompt medical assessment and treatment is crucial to address any potential injuries or illnesses.

In such extreme situations, the other options, while they may seem beneficial in different contexts, do not adequately address the potential severity of the condition caused by exposure to a nuclear event. Drinking water is important for hydration but does not address the underlying issues related to radiation exposure. Finding a quiet place to rest may provide temporary relief, but it does not replace the need for professional medical evaluation. Eating something heavy can be inappropriate if the person is experiencing nausea or other gastrointestinal symptoms, which might be common after exposure to hazardous materials. Therefore, seeking medical attention is the most responsible and necessary action in this scenario.