Clinical assessment tools

A 52-year-old woman complains that she has been missing days of work almost every week; she states she is neglecting her family; and she is sleeping during the day but cannot sleep at night. She denies other health problems, medication or environmental allergies. What are some clinical assessment tools and or techniques that you could use to help diagnose this patient’s condition? From the information provided, list your differential diagnoses in the order of “most likely” to “possible but unlikely”.