This just started for me a couple of weeks ago and my midwife suggested I stay away from anything with lots of spice and salt (plus it's been pretty hot and humid here). The weird thing is if I eat something really spicy my feet only swell the next day. Since trying her suggestion it's really helped. And I put my feet up as often as possible, even at work, and I've barely noticed any swelling since. Kinda freaked me out at first since it's never happened to me before and just popped up out of the blue!
I guess it's just one of the many sexy things in our pregnancy package.... LOL!