Diane is concerned about things at work even when she is at home. she is constantly worried about her home life even when she is at work. diane has a free-floating anxiety that leaves her tense and irritable, impairs her concentration, and results in many sleepless nights. diane suffers from a (n) :

Diane suffers from generalized anxiety disorder.

This means that she is constantly worried about various things - about her work, about her home life, etc. She cannot relax and stop worrying, which is why she is constantly nervous and anxious about things beyond her control. She may be even losing sleep over these thoughts.