i am 22 yrs old and have a boyfriend for 3 yrs we did sexual intercourse and just about this year my menstrual cycle begins to differ. last january my period was normal but from feb to april my menstrual period stop so i tried a pregnancy test but it is negative then in MAY i got my period for a month. up to now this was my menstrual cycle..when i got my anual physical exam the doctor told me it is because of my obesity. what should i do about this?