Hello and thanks for the query
May I know your age and gender? Lots depend on that. If you are a male and above 40 than there is possibility of Prostatitis
. Other reasons are Kidney infection
. In addition to antibiotic you also need a proper alkalizer to reduce burning sensation and take a plenty of water. Also want some more detail to get to a diagnosis:
1. Is their any fever
2. Presence of blood in urine or not?
3. Does you feel any obstruction in passing urine?
4. Any history of Kidney disease?
Hope you will get back soon and I will able to give a more detailed answer.