SHARP PAIN IN URETHRA

HI MY NAME IS DIANA AND I AM FROM GREECE..
I AM 40 YEARS OLD...FOR THE LAST 3 MONTHS ΑΝD AFTER A NEPHRITIC STONE STRIKE THAT I HAD ( IF THAT HAS ANY CONNECTION ) , I HAVE NON STOP PAIN IN MY URETHRA, A FEELING LIKE HAVING A BLADE INSIDE ME, WHICH IS WORSE MOST OF THE TIMES, ESPECIALLY AFTER THE ENDING OF URINATION...IN ADDIDITION MY SYMPTOMS ARE FREQUENCY AND URGENCY IN URINATION...ALL THIS PERIOD I HAVE MADE MANY CLINICAL TESTS AND A MONTH AGO I DID A CYSTEOSCOPY WITH BIOPSY AND DOCTORS TOLD ME THAT THEY FOUND NOTHING SERIOUS EXEPT A CHRONIC NON ACTIVE CYSTITIS...2 WEEKS AGO I MADE SOME TESTS WITH SAMPLES FROM VAGINA AND URITHRA AND URINE SAMPLES...IN URINE GENERAL TESTS ΤΗΕΥ FOUND HAEMOGLOBIN AND PYO BUT CULTIVATION IS NEGATINE... IN ADDITION THEY FOUND SOME KIND OF STAPHYLOCOCCOUS AND STREPTOCOCCOUS IN VAGINA AND URITHRA SAMPLE...I HAVE STARTED 5 DAYS NOW TAKING AUGMENTIN BUT NO RESULT...THE SYMPTOMS ARE THE SAME...PLS ADVISE ME CAN THESE BACTERIA CAUSE ALL THESE SYMPTOMS? CAN MY CASE BE CURED? I M SUFFERING EVERYDAY AND I M DESPERATE...