I've had edema (swelling) in hands and feet after spinal surgery. Any idea why and is it a concern?

WE called the doctor after disc surgery I believe they said L5 S1 was the issue. The seem concerned about the edema but beyond telling me ti drink more (I have, no change) they just say they'll see me Monday. Mu husband is hysterical and ready to take me to the ER. Anything I can say to calm him down or is he right to be so concerned. I'm a 50 y/o healthy female except for the degenerative disc issues