i know exactly what you mean! With DD the only shoes that would fit me were thongs, and that was from about 32 weeks on. I had no other problems.. just swelling. Often it would be that bad (Even after a day of sittin on my butt) that if i pressed a finger onto my shin, it would leave a big dent and take about 5 minutes for the fluid to return to that particular spot.

Definately get your doc to check you out, but like i said - i had it pretty bad also, with no other health concerns. HTH! Good luck for the remainder of your pregnancy!