Welcome to HW - sorry you have reason to be here, but none of us get to choose this club.
I've taken all ranges of antibiotics most of my life, and have never had such a side effect, nor been warned of it.
Swelling in general after DaVinci can be caused for several days by the gas they use to inflate your gut during surgery. It has to go somewhere to dissipate. If you spent only one or two nights in the hospital, this may just now be happening.
I would suggest you call the surgeon's office (ask for the off-hours number and use it). They will know what drugs were used and what side effects you should expect.