Suggest Treatment To Establish Normal Menstrual Periods

It is possible that use of the Contraceptive Pill (12 years without a break), can cause the Pituitary Gland to malfunction when this medication is ceased with regard to conception? Menstrual bleeding has not commenced following cessation of the CP. Gynaecologist says that the Pituitary Gland has 'burn out' - any suggestions? Menstrual bleeding has to be prompted by use of Norethisteron(think that is how you spell it!). Following on with use of Clomid which produces unwanted side effects. What to do to establish normal menstrual again?