You might not be on the right birth control, make sure it's a hormonal birth control and if it still isn't completely controlling your symptoms, talk to your doctor about switching to a different kind of hormonal birth control. Yes, if you stop your birth control, your PCOS will get more severe. The birth control is what helps stop the formation of cysts on your overies, as well as managing the weight gain from PCOS and keeping your periods regular. Birth control is VERY important if you have PCOS