Hello Justine and thanks for the query
I have read your mail in detail and wants to help you out. In my opinion you must get your urine culture done and than according to the culture report you select you antibiotic which are effective on that bacteria.
With Urine culture you also go for USG KUB to rule out any stone or obstruction in the urinary tract
because recurrent Urinary track infection may be due to calculi, Nephritis
or any other type of obstruction.
So consult you doctor and get the investigation done and get treated.