I've never used borax for an enema because I really hate doing those and only do it when I absolutely have to... I just thought using a slight amount of borax would be more natural, and possibly more effective, than any of the mentioned anti-fungal preparations.
Borax is a staple for me though, and I use it a lot otherwise. I mix it into shampoo to stave off scalp issues, hot bath, as an ingredient for a drawing paste, laundry, plants, and yes I will even put a pinch in a tall glass of water. You can purchase boron supplements if your not comfortable drinking the other...
I think someone posted this previously, but it's good and everybody should know about it. It's a very informative article on Borax and the suppression of it's useful medicinal properties: