Bunny, we are like two peas in a pod. I'm sorry to hear about your "plumbing" problems. Drinking a ton of fluids (and Katydid's suggestion of cranberry juice) is the ticket until you get some Keflex or whatever on your hands. You might want to check to see if there are any urgent care medical clinics in your neighborhood. They are way cheaper than ERs and are meant for situations like this, and they usually have Saturday hours!
Seems like all the fun stuff happens over the weekends, doesn't it?