Urinary Infection and Back Pain

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I had a urinary infection diagnosed by lab a few weeks ago. I took three days of bactrim and it cleared up. Since then I had a recurrence and was given Ciprofloxacin for ten days and something called periedium and my symptoms improved. Now I have pain in my left mid back. I have done some research and talke to friends and am concerned that I may have a kidney infection. I am going to see my doctor on Monday but is there anything I should do in the meantime?

Gender: Female
How tall are you (feet and inches)?: 5 ft 5.
What is your weight in pounds?: 180
How old are you?: 22
How long has this been going on?: More than a month
Check all symptoms you are currently experiencing: Genitourinary
Describe associated symptoms not listed above: Nothing else. I just finished the most recent medicines yesterday.
What have you done so far to remedy this condition? Please include tests and relevant studies here. Listed above
Please list any chronic medical problems and also list any prior surgery (lacerations don't count!): none
Check all conditions present in your immediate family... : None of these
Please list any medication allergies that you have : : none
Please list any medications you are currently taking (and dosage if known) :: none
When was your last menstrual cycle?: 3 weeks ago
Are you currently using or do you have a history of tobacco use?: No
Are you currently using or do you have a history of illegal drug use?: No
Please describe your alcohol consumption :: Rarely

What to do over the weekend?
Why do I keep getting these infections?
What do you think they will do next?