Solution for pcod problem?

hello.I have pcod problem.i am only 18 years old.When i was in cl 9,i started to have irregular menses.I went to a doctor.But he told me that i am very young and at the initial stage most of the girls have irregular mens.He didn't give me any medicines.But my problem didn't end. Last year,in the month of july,i went to another lady doctor.She told me to have some blood tests ,sonography and then i found that i have multiple follicles in my ovaries and my insulin level was high.The doctor then gave me harmoni tablets and benforce m tablets.When i was taking harmoni tablets,i had regular periods.For 4 months i took this tablet.The doctor told me to check whether i will have regular period in the next month or not without the medicine. Fortunately,i had my period in the next month.I became very happy and thanked GOD. But this month all my happiness were ruined.I didn't have my period in due date.So tomorrow i will go to my doctor again.Please help me to overcome my problem.You know,i was very fat.I had 52 kg and my height is 4 feet 11 inch.But i have reduced my weight to 45.5 kg.Give me some solutions.I am not able to understand my problem clearly.Due to this problem,i fail to concentrate in my studies.This month i will be 19 years old and my whole life is left.PLEASE HELP.PLEASE....