Thank you for the information,
There are some common causes of such absent or delayed periods associated with itching.The common ones are genital infection caused by bacterial or fungal cause, cervical cancer, pcos, hormonal imbalance, psychological factors, etc.
The bacterial infection may be associated with such symptoms and should be ruled out first.the antibiotics drugs like ciprofloxacin, azithromycin, metronidazole may be needed and the antifungals are of no use.
You should have the relevant investigations done like pap smear, blood counts, sonography abdomen, etc. after consulting your doctor to know the associated abnormality.
The treatment depends on the underlying cause.
Let me know if you have any doubt.