Thanks for the query.
The possible causes for pain abdomen are:
Due to cesarean sections there is possibility of formation of adhesions in between abdominal organs leading to pain abdomen.
In irritable bowel syndrome
also pain abdomen can be seen frequently without any identifiable cause.
is indication the possibility of pelvic inflammatory disease
which can also cause pain abdomen.
You better go for culture and sensitivity of the vaginal discharge
which can possibly detect the cause for the vaginal discharge and treatment can be taken accordingly.