What Is The Cause Of Periodic Pain On The Back Of The Rib ?

a pain at the upper right rib back side which comes and goes off.pain could disappear for days and then comes back for some minutes, somedays and disappears again. mostly felt when bathing,hungry,working and sometimes when asleep. i ve done so many tests as urinalysis , microscopy ,culture. epithelial cells, yeast cells, candida and calcium oxallate 3plus s were seen. i ve taken drugs as ibubrofen,aspirin,paracetamol,ciproxacin,doxcyline and septirin