Started with discomfort in the stomach, nauseating feeling which leads to mild head ache and sever. Have been getting it for the past 23 years. Over the years have observed that it comes twice in the month , during two female hormone secretions cycle. For the past two years I take Headset pill to kill the pain. Just too fed up with this. One of the doctor prescribed sibilium which worked initially. But eventually showing less effect started gaining weight. Just too fed up with this. It's very unpredictable , some say it's stress related and I feel it's true sometimes . I physically fit and regular in exercise and maintain a healthy diet.