I agree with the other ladies. I would get a second opinion. A lot of doctors don't recognize issues like PCOS off the bat. Research PCOS and see if you have any other symptoms and then make sure you mention them to the new doc.
i went thrugh the same thing last year until i was diagnosed with PCO and put on postoval and metformin to regulate my cycle,now i am getting my period every month.so i would highly suggest that you mention pco to ur doctor.what ada symptoms do u have?,like abdominal pains,unwanted hair,acne and weight gain?
There can be a few reasons why you're not getting a period. Some reasons could be PCOS, hormonal imbalance, etc. I would go back and get checked out again, or maybe try a different doctor and see if they can figure out what's wrong. Are there any other symptoms you've had?