Hi goldngr, being overweight
can lead to lots of health related problems. Losing weight could be one of the ways to get your periods to normalise but with your symptoms I feel you need to get your LH, FSH and prolactin
levels done also get an USG abdomen and pelvis done to rule out any PCOD
as this condition itself gives rise to increase in weight and irregular periods
.Visit your gynecologist and discuss this possiblity with her. IN the meanwhile I would strongly recommend that you try and lose the excess weight and try to get as close to as your physiological range.