im 16 and had my period since i was 14 but was really irregular, but for the past 11 months i have not got my period and have not yet been to the doctors now i know im not pregnant as i have taken them tests, i do smoke alot of pot and have lost a bit of weight, i get really bad stomach cramps and do find eating hard sometimes because of it. wot could be the cause of not getting my period for so long? yours sincerely bec