Hello, Conrad (@earlt)
It sounds as though you and I have undergone the same battery of tests. I find it curious, though, that you, too, have swollen feet. I've had similar experiences: doctors examining me for something entirely unrelated to my feet have often asked, in an offhand way, "Have you any idea why your feet are swollen?" Mine, too, swell and then un-swell, depending upon what I've been doing or what sort of shoes I have been wearing. To date, however, no doctor has linked my swollen feet to my neuropathy.
Ray (@ray666)

Try anti-embolism stockings to decrease swelling.

Conrad, you might find compression socks helpful for this. They come in different “strengths”. The 20-30mm are pretty snug. I don’t have swelling, but have heard others refer to them.