Suggest Remedy For Irregular Menstruation

I am 23. I weigh about 290. My periods are irregular. They use to be regular. Then that changed about two to three years ago. I am not sexually active and still a virgin. My last period was Nov 8th, which lasted a day. Usually when I have it, its a week long.The one before that was Oct 6th and before that June 7th, which both lasted roughly a week.