you need to see a urologist. i am sure you will find very skilled urologists in japan including some that may speak english. just in case you could bring your own interpretor if you have a trusted bilingual friend.
i am living in japan and dont know whom to turn to regarding bladder issues. have resorted to wearing pads wear daily and to help my situation having to go to the toilet every half hour or so to relieve. the pads are soaked and i don't know whom to turn to. we are living in japan and translation is difficult as my lack of the language. it started from childbirth although i had a caesarian. i cannot walk down a hill running or jumping is out of the question or exercise without having to go to a restroom. i would appreciate any suggestions or help.