Putting your feet up helps, especially if you can elevate them while you're in bed - tricky as hell I know. Also make sure you're drinking plenty of water as I found if I got dehydrated my body would try to hold onto it's remaining water for dear life - strange I know. Reducing salt intake can also help.

I didn't get the urge to walk at the end, I got the urge to swim. A lot. Walking in water could be a good solution for you if you can organise it as the water will support your belly and reduce any further fluid retention that tends to happen if you've been on your feet a fair bit.

Other q for you though - was your blood pressure ok at your last check, or has the swollen feet come on really quickly? If it has, might be an idea to talk to your caregiver as it can be a sign of pre-eclampsia.