I took my son to a hospital appointment (his first) this morning. I worked from home before the appointment and was in work before lunchtime, yet my manager is insisting that because I went to the dentist a couple of weeks ago, I have to take half a day's holiday today to cover both absences. A man in my office took this afternoon off to have his car washed. Am I being unreasonable in being angry? I work for a large utility company.