Mrs. Karen Stevens - Part 2

The events leading to her referral to you are the following:

One Friday evening in January, Karen was not feeling well and decided to visit the emergency department of her local hospital. She told the physician who examined her that she was feeling very tired, nauseated, and clammy. She felt some discomfort in her back and chest, but described her main concern as a general feeling of weakness. Karen was found to have a normal temperature and seemed very anxious. The emergency physician told Karen that she likely had a flu, and sent her home with instructions to rest and monitor her temperature for fever.