Hello and welcome to HCM.
Thank you for your query.
In primitive times, when medicine had not developed in the field of testing and laboratory analysis to support a clinical suspicion, doctor's used to prescribe medication, without requesting for any investigations to support the diagnosis. But, this comfort has been abused in today's world. Although, a good doctor would always request for the right investigations and a minimum number of them.
A urine examination or screening for sexually transmitted disease
is always necessary in patients who present with symptoms relating to the urinary tract
or the genitals. Add-on investigations also exist in case the main cause is not found, but at present, I would first recommend a urine examination to confirm/rule out a urinary tract infection
(UTI). Once this has been diagnosed you could go about a urine culture examination, which will provide the doctor information on the most suitable antibiotic that can be used to treat you, in which case you will be advised one antibiotic, which will be the right one.
If the urine analysis returns negative, getting screened for all sexually transmitted infections would be a wise next step.
I hope I have succeeded in providing the information you were looking for. Please feel free to write back to me for any further clarifications. I would gladly help you.