@donasmrs-- I have never tried a vinegar douche but my sister-in-law used a douche with apple cider vinegar for her chronic yeast infection. It didn't work, and apparently burned a lot as well. I think vinegar has to be diluted with a lot of water when it's used as a douche. Even then, it may be irritating. I don't think it's the best remedy for a yeast infection.
Instead, I recommend you to use a douche with propolis. There aren't many studies on this, but the few studies that were done showed that a douche with propolis can treat yeast infections without side effects. I'm not sure where this douche can be found or if you have to mix it yourself at home. But it sounds like a great option.