hi seeing as tests have come up blank i would start doing a course of kegels just google kegels and you should find out how to do them there very simple it could be you have a weakness of the bladder doing these will strengthen it up if you can find them you can also do reversed ones as well so you would be working your pelvic floor both ways. i do hope these help you. good luck
i'm 17 with an overactive bladder for a few yrs now. why? . i'm 17. female. athlete. only recently sexually active. tests for infections have all come back negative. gets worse with exercise. frequency varies. what's going on?