Negative test results for UTI

I don't know what to do. Four days ago I thought I had a UTI so I got a three days of meds from the doc. Took them all and still have bad symptoms. Went to the doc this morning and she said the test was negative and that maybe it's going away so she just gave me more of the same meds. They used to help now they are not helping very much. She is doing a culture test on my urine sample now. I'm getting married in two weeks and I really don't want to have this pain on my big day or on my honeymoon. Can anyone give me guidance on what to do?