A 63-year-old woman presents with a 6-month history of difficulty swallowing. Shortly after swallowing, she feels like something is getting stuck in her upper chest. The difficulty swallowing seems to be worsened when the patient is stressed and when she eats hot or cold food. She denies weight loss and night sweats and reports no other problems. Physical examination of the patient is otherwise non-contributory. An extensive gastrointestinal evaluation, including a comprehensive endoscopic evaluation, is negative.What is the first-line treatment for this patient's symptoms?

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