I am overweight, and working to controll this. For a few years I had irregular periods. I would go a few months without having one, and when I did, it would be quite heavy. The doctor told me this was normal for someone overweight and as long as I had one every few months I would be fine. Then I stopped having them altogether for a while. Now I have constant bleeding. It is not heavy, just spotting most days, but every week or so there is a heavy day. I am worried about this fairly sudden change in my body, what could it be?