@lotsofpain I agree with @sueinmn it is probably not the surgery, but it could be the lack of mobility. I know it's tough, but you do need to try to get up and move around every hour for at least 5 minutes. Sue's other suggestions are good too I think. Plus, use some compression stockings, even mild compression can help.

The only time I had so much swelling in my feet and ankles it was from an entirely different cause so you do need to try to distinguish what it's from. Hopefully your PCP can help with that. I had this last year and mine sent me for a couple of ultrasounds which ended up not showing anything so it was thought I had Chronic Venous insufficiency but I'm not sure that was accurate either because they seem to be fine now.
JK