sick call

don't you hate it when you have to call in sick. you get all nervous, you don't have the right words, and you don't want your boss to think you're faking it. that's me today-i called in-and my boss kinda sorta gives me the guilt trip. now i don't call in sick. actually this probably the 2nd time i've called in sick in 8 months. but why do i feel guilty for doing it?