Hi,thanks for writing..
Do you gain weight excessively.. If so get a scan and hormone test to detect PCOS. You can take Primolut N
For 5 days and get your periods in 7 days. Take OCP's for 3 months if you are not desiring pregnancy
.. Medication for headache or fever
donot alter menstrual habits.It can be due to stress
or PCOS.. Hope I have answrred your queries.. Good day..