Suggest Treatment For Swollen Uterus?

I am a 39 year old female that had recently been told that my uterus was swollen but not enough to do anything about. My stomach will swell sometimes to the size of what i was when i was around 5 months pregnant. What can i do to keep from swelling? and what can i do about he weight gain i have put on after my third child? I had my third child within a year of having my second. For 7 days they are the same age. The labor with the third child was much harder and difficult then the others and he was bigger weighing 7lbs and 3 oz. I was always a small person weighing around 125lbs when i wasnt pregnant and never gained more than 30 pounds with any of my pregnancys. I am only 5 foot 2 inches so i cant gain alot without looking really round in the middle. But even my husband talks of my swelling it looks swollen and will actually go down in size. I now weight around 155lbs. This is what i weighed when giving birth and i am just wondering what can i do to lose this extra weight and the swelling??? I have tried everyting.