Apple cider vinegar (with the mother) a couple of table spoons in a bottle of water.
@kclaireeabbey it depends on the severity. Just down a bottle (water and couple tablespoons) and see how you feel. I do it for UTIs & it usually eases the pain after a couple of bottles. You still may need to go to the doctor but it will give you so e relief until you get an appointment.
Apple cider vinegar flushes the bacteria out. Try that. Mix it in water and drink it until you can see a doctor.