Sex with girl. bladder 7mm thick. urinalysis, culture, vdrl, cbc completely ok. very little pain/burning during urination. took antibiotics for 2 weeks. drink 3-4 liters water/day went to 2,3 urologists but symptoms still persistent. why?

Discuss with one of the urologists. It's not due to any infection, including STD. A strong possibility is genitally focused anxiety, if you are feeling guilt, shame, or regret about a sexual exposure.

There are several explanations. It may be the wrong anabiotic and it may be an STD or maybe bacterial it really depends on the organism.. Other non-infectious ideology should be considered as well. If the symptoms are pain or burning upon urination it sounds like they are mild if there were other symptoms you should explain what they are so we can Investigate.