Hey !! I Need Help... I'm 25 Years Old And

Hey !! I need help... I'm 25 years old and having periods issue from last 5 years. It was irregular I got periods after 3 months , 6 months then 8 months !! I consulted different doctors. They gave me diane 35 ! I took that med many times. But when ever I stop taking that pills I don't get periods naturally... I now it's been 6 months again I don't get periods..I'm going to marry in 2 months and I'm so much worried about this issue...