Regarding the douches, I’m not an expert, but a lot of doctors say it’ll do more harm than benefit, because they flush good bacteria along with the bad ones, and make epithelia more sensitive. I’ve tried them though, because I’m at the point when I’ll try anything, but they didn’t help me unfortunately.
Regarding the cause of vaginal candidiasis, I was also wondering the same question, but didn’t find the answer yet. Louise Hay says that female problems mean “denial of the self and rejecting the feminine aspects within”, but personally I think it’s different from person to person, and maybe my cause is different from yours, although we have the same problem. So basically I think we have to individually find it in ourselves, but maybe the cause isn’t so important, it’s more important to focus on healing and getting better. I definitely support meditation, I also started it recently, and it really helps me with my depression and mood swings.