I also got it from a dose of antibiotics that shouldn't have been given to me (long story). And was treated with the same drugs Rob was--only they started me on the vancomycin (Vancocin) in the hospital, as Flagyl makes me desperately ill. What happens is basically, all the good bacteria in your gut get killed off for one reason or another, and clostridium difficile, another kind of bacteria, takes over. When it progresses to pseudomembranous colitis, which it did with me, it can cause incredible diarrhea, vomiting, etc. I was in the hospital for eight days, nearly died. Obviously this isn't what's going on with you, or you'd be dead already.
It can also be a disease that you catch AT the hospital, known as a nosocomial infection. Evidently C.dif is quite virulent, hard to kill, and fairly easy to transfer, so yes, if you actually have C.dif, you should at a minimum be cleaning your bathroom, particularly the toilet, frequently with strong disinfectants, and you should be treated with some serious antibiotics. If you have C.dif-caused diarrhea, there is a very specific, eggy smell to it that is completely unlike any other elimination you've had in your life (TMI, I know, sorry). Here's a link to the Centers for Disease Control's webpage on the bacteria:
http://www.cdc.gov/ncidod/dhqp/id_cdiffFAQ_general.html
I can give you one piece of advice. After trying every preparation under the sun, the only thing that finally got my gut back in tune with itself was taking yogurt cultures, also known as acidophilus or lactobacillus acidophilus. They started me on them in the hospital, you can get them in capsule form at most pharmacies--they keep them behind the counter because most must be refrigerated. They really straightened me up, and any time the smell came back, I would just go back on the acidophilus for a week, and I did fine.
Here's another webpage of a guy with personal experience, and he mentions the yogurt cultures, as well:
http://www.cdiffsupport.com/aboutcdiff.html
There's also a good article
here.