Sentence 1: Kay was at work when a headache started. 
 Sentence 3: As she sat at her desk the pain grew more and more intense 
 Sentence 4:  Soon the pain was accompanied by nausea 
 Sentence 5:  Kay struggled through they day and went home and straight to sleep 
 Option 1: She didn't take any painkillers normally and decided not to this time. 
 Option 2: She decided to leave early and go to the doctors.