Welcome to .ehealth!
I'm sorry you've been given the run around about this. It sounds alot like a kidney infection to me. but I'm not a doctor. To help prevent (or lessen the occurance) on the infections there is a few things you can do.
First, Drink cranberry juice, as often as you are comfortable with. If you don't like cranberry juice they make a supplement now.
Second, Drink,drink,drink. You need to keep your system a flushed out as possible. You get an infection when the bacteria in our body sits in the kidneys for to long. That is also why it is important to never hold your urine. When you need to go...go.
I hope that was some help. I'm sure someone else will be by with some tips too.
I hope you stick around. Keep us posted!