Had the special anxiety that comes with being ill and can't decide if I'm well enough to go in to work(longing to get back to work). Made the inevitable stressful phone call often later than is convenient for them. The huge pressure and exhaustion of 3 previous days upset stomach - and getting to feel like I let my colleagues down. :(

I know full well people who fake sick days after a hangover, with no guilt and it blows my mind.