welcome to healthcare magic,
well you could be suffering from a urine infection as you are going to urinate frequently with back pain
and lower side stomach pains.
if you have a discharge then it can bring the same kind of symptoms.
you might be having ovarian cysts which could cause to have pain in the stomach. an ultrasound
would be of great benefit.
i would suggest you should visit a gynecologist to be reviewed and be given appropriate treatment.
hope to have answered your query.