Weight loss and abnormal periods

Hi crew, so I'm down 15lbs on the shake business (a few cheats).  But I have my period for the second time in less that 15 days?  Anyone else have this problem?

After my lapband 7 years ago when I began losing weight, my cycle really really got out of whack . The gyn says diet and weight loss can definatley cause this 

Yes......it messed mine up.  I used to be able to count ahead 26 days on the calendar like clockwork.  Could plan beach vacations months ahead........to now where every month is a waiting/guessing game.  They still last 5 days but the 26 days has went to typically 30-40.  ??????

I have read about people having all sorts of cycle chaos.  

I'm post-menopausal so I didn't have this problem, but it doesn't really surprise me.  Estrogen is stored in fat cells, so I can see why your body might go haywire when you start losing a lot of fat.