What is Mrs. O'C's primary symptom? What is Mrs. O'M's primary symptom? How do their attitudes differ about their symptoms?

Mrs. O'C wakes in the middle of the night hearing loudly and clearly Irish songs from her childhood. Over time Mrs' O'C's symptoms fade. Mrs. O'M has been hearing the same songs in her head for years. They are three hymns that she knows. The songs get worse over time rather than dissolving. Mrs. O'M dislikes her disorder intently whereas Mrs. O'C seems much less distressed.