Hang in there - you're in the home stretch! During my first pregnancy, I had horrible swelling all over. I actually lost 30 pounds in the first week following my daughter's birth because it was all water weight (well, 10 lbs of it was the baby, placenta, etc, but the rest was all water)! As they say, "this too shall pass". Like others have said, just try to stay off your feet as much as possible and keep them elevated above your heart when you can. I work at a desk so this was not possible during the day but I WAS able to put them up under my desk and even that little bit helped slightly.
I would still talk to your doctor about it to make sure there is no underlying issues but this isn't that uncommon... Especially since your blood pressure has been normal,e tc.
Hang in there :)