Suggest Remedy For Missed Periods

Madam, I have menstrual problem from almost last 7 years and i was taking treatment for the same till August 2010, I am a female aged 25 years and married from last 4 years as i am having the problem i am not getting pregnant i had done my laproscopy in December 2009 and my tubes are open i had IUI 3 times but it also failed and after that i had regular periods for 4 months and then again i had not got my periods from last 3 months going to the doctor and taking medications for the same and then getting my menstrual cycle is the only thing which i am doing now or to have regestron and then get my periods please tell me what should i do or which medicines is suppose to be taken