i was diagnosed with bacterial infection few times in the last few months .. i was prescribed with a course of antibiotics , veginal cream and veginal tablets .. there is the vagisan lactic acid tablet that i use every three days to keep the ph of veginal flora at normal level. my symptoms always get better but they come back following my period. this month i felt very bad pain in lower back and left side of my abdomen prior my prior which was late for 2 days. i had pain during sex and yellow discharge with no smell. now i have a itchy and burning sensation in the veinal area during my period for the first time...what is this? the burning was really bad the day before my period .. i do not know whether it is because of using vagisan lactic acid tablet or a new infection? please help..