Final answer:
The symptoms described are most consistent with a panic attack, though they can mimic other conditions. Immediate medical attention is essential for a proper diagnosis to rule out severe conditions like myocardial infarction or neurological disorders.
Step-by-step explanation:
Given the symptoms of numbness and tingling of the left arm, weakness of the left face, and chest tightness that occurred suddenly during an emotionally charged situation, the most likely diagnosis for the 21-year-old female is a panic attack. Panic attacks can include symptoms such as chest pain or discomfort, tingling or numbness in the extremities, and can often mimic other conditions such as myocardial infarction (MI) or neurological disorders. However, in the context of a heated argument and without more definitive symptoms of those other conditions, a panic attack remains the most probable diagnosis.
MIs typically present with retrosternal pain and other systematic symptoms such as irregular heartbeat, difficulty breathing, and even fainting, which are less likely to be solely triggered by stress or an argument. Neurological conditions such as stroke or multiple sclerosis may present with sensory loss or the 'pins-and-needles' feeling but would not usually be triggered by an argument and would likely present additional clinical signs that require rapid medical assessment.
Since many medical conditions can present with overlapping symptoms, differential diagnosis by a healthcare professional is essential. For immediate treatment, it is crucial to seek medical attention to rule out life-threatening conditions like MI or stroke and to get a proper diagnosis for the correct management of the symptoms.