Hello...I Have Been Having Swelling Of My Legs From "water"

Hello...I have been having swelling of my legs from "water" for about 2 months my dr put me on Lasix, which does not seem to be working. It has only been getting worse. I also noticed latley I have gain about 20 -25 lbs and can make impressions in my legs where I press. I noticed just the other day I can do the same in my belly. Im a 45 yr female, 300lbs no smoker but diabetic