Final answer:
If Randall Pearson's symptoms persist, he might be diagnosed with panic disorder, which is marked by intense, sudden episodes of fear and physical discomfort.
Step-by-step explanation:
If Randall Pearson experiences sudden episodes where he cannot breathe, feels his heart racing, begins to hyperventilate, and becomes worried that he is dying, and especially if these episodes continue, he might be diagnosed with panic disorder. Panic disorder is characterized by unexpected and repeated episodes of intense fear accompanied by physical symptoms that might include chest pain, heart palpitations, shortness of breath, dizziness, or stomach upset. It is distinct from the other options given, like generalized anxiety disorder, which involves persistent and excessive worry about a variety of different things, and bipolar disorder, which encompasses periods of both elevated mood and depression.