Looking at this from an employer's point of view, luckily for me not many of my staff pull sickies as they are very team orientated and doing so, means that their fellow workers have to work twice as hard to cover the absence of someone who just fancies having the day off.
Do you ever get fed up when it happens to you, or does this not really bother you? I am not trying to lay a guilt trip on you, well only a little one! But you do need to think about the effect it may have on your fellow workers.
Cheers, Sue