Help!

I have a really bad UTI. I get them all the time and the medicine the doctor prescribes doesn't even help. I don't drink sodas, I don't take baths, because the doctor told me that's what was causing it, but i still can't get rid of it, and If it goes away it comes right back a week later if not sooner, the doctor won't help me.. Hopefully you guys can! Thanks in advance.