Just an interesting note to make about yeast verses bacteria. In my case, it is very discreet bacteria which causes symptoms. This is because yeast is in defensive posture, and the bio-active metabolites cause several factors which activate yeast to produce poison[s] etc. and to cause it to revert to a more pathogenic state.
I have increased salt intake and yeast production has gone WAY up, causing the bad bacteria to be killed off, reducing a large part of my symtoms including itchy anus--comparable to female vaginal infection. The yeast is out numbering the bacteria, so I guess it reduces it's secretion of metabolites! Shroom