After posting the above inquiry, I was feeling desperate and decided to try an enema with apple cider vinegar - I prepared almost one quart of water with a quarter-cup of the acv (but actually was only able to use half of the mixture, in two enemas). In my stools, and in the toilet water, I saw many white-ish flaky bits. Some floated, some were imbedded in stool, and there was also (each time) a pile at the bottom of the toilet. I was kind of disappointed, because I had hoped to see a large mass, instead of so many little (1 cm) flakes. And is it possible that the pile of flakes at the bottom of the toilet were candida? I'm curious as to what would make it sink - seems like it should float.
Thanks for any more info... I'm learning a lot by reading the archives here.