It can be very frustrating trying to find a solution to this problem. Try to find out the source of the problem. Have you had hormone levels done? It is important to have these done to find out why your periods are irregular. Don't let the doctors brush you off and tell you that there isn't a problem. Are you having any other symptoms besides irregular periods? Have you gained weight? Have acne? Excessive hair growth? Lower abdominal pain? Is there a history of diabetes in your family? First off, get your hormone levels checked and ask to have a pelvic ultrasound. There is a syndrome called Polycystic Ovarian Syndrome and one of the symptoms is amenorrhea. Like you, I endured years of frustration because no doctors would listen to me. Good Luck!