I also no longer have a menstrual cycle but I have read several posts regarding heavy and painful periods after starting this WOE. Hormones are stored in fat and as the fat is burned the hormones are released. Some women experience increased PMS, pain, and heavier flow like when they were teens and first experiencing their TOM.

You could do a search on past threads "TOM", but I know lots of nice ladies will post here with great advice for you.
And I must ask the obvious...could you be pregnant?