What's a natural way to cure a bi without taking medicine ?

Forgive my frankness: Some of the natural remedies, especially the cranberry products (not the popular juice) may be helpful. But you would be very, very foolish not to use an antibiotic. In the bad old days, this was perhaps the foremost killer of women your age, along with obstetrical catastrophes. If somebody told you "natural is better", go to an old graveyard and see how long people used to live. Get a real rx.