Major swelling/edema HELP!

Are you eating well? Are you having any 'unusual' pain? What does your doctor think?
If you are not having severe pain, no fever and all is well then it could just be bloating and swelling and all of that will resolve soon enough.
You might be able to nudge things along by drinking warm lemon tea (squeeze a lemon into tea) or homemade lemonaide.
It is way too soon to start taking stuff at this stage in your convalecence.
There are some diuretic teas but they might irritate your bowels too and you really don't want that.
Give it time, don't rush things.
Sharon

There is a phenomena known as "third spacing" that occurs frequently after abdominal surgery. It will resolve on its own over time. Be patient, stay well hydrated and keep up with your protein intake. Please don't use any diuretics or medications for this. You are very go fresh after your surgery and just beginning to heal.