Suggest Treatment For Irregular Periods Due To Having PCOS

Hello doctor.. this is ANJALI, I am suffering from irregular period problem. I have a gap of one or sometimes two months between periods. also I have get diagonosed many times but result is always normal. I have get done LSH, FH and prolactin. it comes always normal. Doctor says that I have ovary cysts (PCOS). I have taken many medicines also but all in vain. Please suggest me what to do? AGE- 24 , WEIGHT- 45.