I'm A 48 Year Old Woman. My Periods Have Been

I'm a 48 year old woman. My periods have been extremely heavy for the last two years or so, usually I don't experience alot of cramping, but now this here last month, not only did it come whenever it felt, it wasnt nearly as heavy, although I noticed Im having more of a yellowish discharge, but very heavy for a discharge if you know what I mean more than it is blood. Some days it has a foul smell where as other days no smell at all with the discharge. I've also notices that my abdoman almost looks like Im about 4 to 5 months pregnant, and its really firm, not jiggly, oh and I do have unusually uncomfortable cramps this month, any ideas?