But I want to point out a series of perspectives for you. Negative culture does not mean no bacteria are present. Presence of bacteria does not mean they cause your symptoms. Pain does not mean you have an active infection. Pain may not be felt at its source.
Inflammation can exist without bacteria present.
For example, an allergic reaction can cause inflammation. Factors like those I have listed are what makes effective treatment of prostatitis so hard to achieve even for the team of a caring doctor and a dedicated inquisitive patient. My general conclusion from the puzzle is that each patient has to remain open-minded about possible causes of his symptoms and possible things to do to reduce symptoms. Beware the person who posts on the Internet, based on his symptoms, that he knows the cause and treatment of prostatitis. It seems there's a wide range of causes and partially effective treatments that vary for each individual.