Copper t is antiseptic, unlikely that is the cause. As u have frequent infections , don't change the doctor so frequently as everyone's approach to it will be from beginning. Generally your partner also needs to be treated, in recurrent infections generally urine culture and sensitivity, vaginal discharge for culture sensitivity and also pap smear are all recommended in addition to blood sugars testing for diabetes ! Jus consult with your gynecologist for complete analysis and treatment accordingly to be treated.