Thanks for the query.
Pain abdomen, lower back, breast etc can be seen during ovulation and menstruation
The possible causes of your continuous pain are:
Pelvic inflammatory disease
So you once undergo swab from the vaginal discharge
and culture and sensitivity, ultrasound examination.
By this the possible cause for your problem can be found out.
Better to use plain water to clean the local parts, avoid disinfectants, harsh soaps etc which will increase the chance of bacterial vaginosis