I too have edema in feet, legs and also hands along with my idiopathic pn. I did have it before my pn. Now that my feet are totally dead, I wear Merrill shoes so that I am familiar with how feet hit the ground. I also do not know if shoes fit correctly any more and it helps by sticking with a familiar brand.
I notice when I remove my clog type Merrills how funny my feet look because yes the part in shoe is smaller than my swollen looking ankles above it. I can still feel how tight my legs are when they are swollen tho.

My doctor back in late 90's told me to lie down two hours in morning and then again two hours in afternoon. Good luck with that. But when I have done so, it did help. I have also slept with my feet and legs raised at night time. I never turn on sides and have scared two different sleep specialist because I never move during the night. I even warned the last one and he still had to check on me to make sure I was okay.

That same doctor did recommend that I wear compression stockings. I tried too many times but they were so hard to get on that I seldom wore them. They did help when I could manage to get them on but by the time I managed I was usually to tired to go anywhere.