Hi. My husband has had a horrifying experience with crohn's and c-diff. C-diff is an extremely difficult infection to beat really. My husband has been on vancomycin since March, 250mgs 4 times a day. He was in the hospital for 2 months fighting crohns and c-diff, and is now down to 5mgs of prednisone. A couple of weeks ago, his docs thought it was safe enough to stop the vancomycin, and within 2 weeks, his infection came back. So, he's on the vancomycin again.
The reason why c-diff is so hard to eradicate is because it is a spore forming bacteria. So, when you start taking the vancomycin, the bacteria hybernates in spore form, which the vancomycin can't kill - the vancomycin can only kill the active bacteria. When you stop taking the vancomycin, the spores become bacteria again, and start multiplying until you end up with enough c-diff bacteria to start causing symptoms.
You should definitely get your stool tested asap. The very loose stool, and the very foul odour is very distinctive of c-diff. Please go right away and get your stool tested, and maybe even start taking vancomycin immediately. Talk to your doctor asap. Or if you go to the ER, they'll test your stool right away, and give you results very quickly.
Also, there are some things that may help you defeat a c-diff infection - the next time you try to wean off the vancomycin, perhaps you can discuss with your doctor a pulsing regimen, whereby you don't stop vancomycin abruptly, you taper (take vanc 5 days a week, then 4 days a week, etc). This pulsing regimen should help fill off the spores as they become bacteria, and hopefully before they produce more spores. Also, a yeast called saccromyces boullardi is thought to help ward off c-diff, and of course probiotics. Also, when you start the pulsing schedule with vanc, it maybe helpful to go to a very low carb diet - since carbs feed bacteria, including the bad bacteria, helping them grow in numbers. Starving them may help kill the bad bacteria.
Good Luck. My husband is still struggling with his c-diff infection. But thankfully so far, c-diff has shown no resistance to vancomycin, and seems pretty gentle on the system overall, since it's mostly absorbed just in the gut. Please see a doc right away and get it tested. I hope it's not c-diff, but if it is, it's important to start treatment right away, before you end up with c-diff colitis.