MSFinals-1377
A 28-year-old woman presents with complaints of intermittent abdominal distension and bloating. She experiences bouts of loose motions that provide relief from the symptoms. There is no history of rectal bleeding or weight loss. The patient works as a manager in a busy office and finds work to be stressful. She has previously taken a course of fluoxetine for depression/anxiety. Abdominal examination is unremarkable.
What is the probable diagnosis?