Hello.
You have irregular cycles since when? What is the gynecologist opinion for that? Are you on any medication for your periods?
Have you done USG of Pelvis, to know the status of the uterus and ovaries. Any ovarian cyst?
If USG Breast is normal and there are irregular cycles - it is most likely ovarian issues.
Next Steps
Do you have any medicine allergy. If no, then You could try analgesics like paracetamol, 500mg, 3-4 times a day for 3 days.
Health Tips
USG PELVIS AND GYNECOLOGIST RE-OPINION