age 30,female,currently on homeoapathy ,suffering with urinary pain since last 3years.culture test done no positive results,no growth of any bacteria .severely burning and piercing pain while urination.sometimes it aggrevates by sitting on hard surfaces for a long time,pain starts anytime abruptly and if i lye down it disappears.dont know what it is,checked with lots of urologists .they dont have any solution to this .some said urethritis or , vaginitis .donnt know what to do??plz. help someone.