I had surgery Feb. 27, 2019 and had abdominal swelling. The hospital and my surgeon said the swelling was not swelling, they said my stomach appeared to me to be swollen because I did not have breasts. I started physical therapy 2 weeks ago and the physical therapist could tell right away that it was fluid. She did Manual Lymphatic Drainage (MLD). So, yes, I have lymphedema and the massage moved a lot of fluid out. She had me purchase an abdominal binder which I wear only during the day. Also, some elastic type shorts that come up to belly button and that have a wide elastic band for waist. I bought them from Dick's Sporting Goods Store. I bought the 9" abdominal binder from the medical store called Aids for Recovery. I wear the abdominal binder during the day at work and the shorts if I'm relaxing around the house etc..
Be sure if you go to a physical therapist that you confirm that they have been trained in lymphatic massage. Also, try walking to help.