This is my second year at this job, teaching English and Drama. Last year I had a car accident and was off work for a week (i came back to work after a week, as they were desperate!) Now we are only 4 weeks in and i've had to have three days off as i have suspected shingles, i feel like the HOD is annoyed with me and i always feel like i'm letting the department down. Should i be so worried that i cannot sleep at night? Please help?