What Causes A Painful And Swollen Tummy?

I have a very swollen tummy, it is painful and noticeable, I look pregnant. I am 51 and Not pregnant as husband had the snip when our 13 year old was born. I had numerous polyps which were causing extreme bleeding during my period and I was checked for menapose hormones end of last year. They said I was not producing the markers. I and the Marlena coil (not sure correct spelling) back end of the year and it has addressed the bleeding. I only have odd spotting till last week. I had slightly more bleeding, needed to wear a pad for a few days, very dark ans stringy. My husband noticed the swelling last week, but I really an see it now, it is painful, I get pain in all positions, sitting standing it is breath taking at times. Lower tummy pain and slight tenderness when pressed. Bleeding has all but stopped.