Final answer:
The most appropriate treatment for the patient's symptoms, which may indicate myocardial ischemia, is aspirin, nitroglycerin, and morphine alongside oxygen, IV normal saline, and transport to emergency care.
Step-by-step explanation:
Based on the clinical presentation of chest pain described as dull, located substernally, radiating to the neck, accompanied by nausea, lightheadedness, and diaphoresis, the most appropriate treatment option, in addition to oxygen, IV normal saline, and transport to the emergency department, would be aspirin, nitroglycerin, and morphine.
This combination of medications can help address the potential underlying issue of myocardial ischemia by relieving chest pain, improving blood flow, and reducing clot formation.