It's funny you mentiond these things because some of the things you mentioned actually are proof that your situation could be anal related/gastrointestinal.
When women sometimes get yeast infections or other fungal infections from yeast and other growth they mostly concentrate on the infection in the vaginal area. Also when we take probiotics mostly we stick to the probiotics for the small colon and don't necesaarily focus on the large colon.
In the large colon is where the food is made into feces and goes out of the rectum. It is also where most problems in the rectum such as bleeding and other problems originate as well as some fungal infections.Probiotics with Bifidum,rhamnosus and other strains are very helpful for the large intestine and also help antifungal infections,at least from the info I read on the site said they do.
Good bacteria in the large intestine is important. Intothewild said that he or she used the same type of antifungal cream that is used for yeast infections to treat the problem they were having inside their rectal area and it helped them. I'm just saying that there may be something that some are overlooking when it comes to having a fecal odor problem, and since the both are connected maybe both areas need to be treated.