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I have no idea - sorry, Hope someone helps soon. Could be the heat and water retention but think you should speak to someone today - maybe mw/hv team - whoever is managing your care. They could well recommend a GP home visit or some home treatment.
My feet and ankles swelled so badly the week before birth that I couldnt wear shoes with DD2 - lasted for a few days after birth - dont know if that is the same or not. Sorry. They didnt give me any medication just told me to do gentle feet circles to get circulation going and to take it easy, not much help though.
Mine did this first time around in the days afterwards and in the latter weeks of pg second time. Try to keep moving, difficult though it may be, as inertia will only make it worse and do the foot circles mentioned by basketcase when you are sitting or lying, plus drink lots of water to try to flush it through. Do mention it to your mw at her next visit too.
Did you get any high blood pressure in pg? This is one of the symptoms I had with my hbp but it started to go after delivery - agree you must insist to see your GP and as them to come out - mine came to my home whilst I was off with very high bp in pg