This is a subject that sometimes comes up on the DS board. About a year and a half pre-op, I started having more "sporadic" periods. Six months prior to surgery, my periods stopped completely. I know that the stopping of my periods came from two things: rapid weight gain, and an extremely stressful and intense job situation.
About a week post-op, my periods have returned. They have been regular every since. What I have noticed is that each month, the intensity of my period side effects (stomach cramps and lower back pain) has increased greatly. Last night from 1AM to 3AM, I was in bed doubled over with pain.
Thank heavens the pain has subsided this morning!