Ammenorrhoea or absent menses can have many causes and so it is important that you consult with your Dr and gynaecologist to make sure that there is no serious underlying cause.
However, being overweight can result in irregular or absent menses. it is important to following a healthy eating plan and lose weight as well as exercise regularly. Eating 'heating' foods such as garlic, ginger, cinnamon, chili may help increase the metabolism and stimulate your menses. There is a product called menoherb which is usually prescribed in the treatment of menopause but also has emmenogogue activities which means that it will help bring on your period. In conjunction with this i always prescribe livotibb as this will help with the metabolism of hormones.