I Had A Surgery Myomectomy , And Right Ovarian Endometriosis

I had a surgery myomectomy , and right ovarian endometriosis on 7of january 2014 after the operation my mensturation became irregular and as my surgeon prescrbed started taking visann 2 mg from August .I supposed to take it for long period of time but I took it just for 2months .after DC visann I got my cycle after a month 09/31/2014 and the 10/06/2014 was my second period and then I didnt have my cycle till now .just want to know whats the problem ?