How Can Menstrual Cycles Be Regulated Without Medication?

Hi i m 21 year old girl and i m suffering from PCOD...i was 14 years old when my period started...but it was very irregular from that age..i consulted gynecologist also...but my problem is my period come only after taking the medicine only. I want my Menstrual cycle to be regular without taking any medicine. and i m very concern about my health taking proper food and doing healthy diet so my period will regular..please help me so that my menstrual cycle will be regular without taking any medicine. thanks in advance