In case you were wondering if the ailment you're faking to get out of work is rampant in your neighborhood, visit whoissick.org. The site allows you enter your symptoms (stomach ache, runny nose, severe malaise) and then see if anyone else around you has those or any other symptoms. Or you can simply browse with morbid fascination.
You can narrow your search by symptoms, age, sex, and time period. There's also the saddest little tag cloud I've ever seen (see image above). I imagine that's what the brain of a hypochondriac looks like.