I was getting a bunch of swelling in my calves, ankles and especially feet. I found it had a lot to do with sitting in a screwed up way, laying long periods of pressure on my feet as a painted or diddled on the computer, all tired and sagging into a bad position. Also fell asleep in my chair a number of times. And being all cockeyed for long periods basically pulled the ligaments and tendons hyper-flexing it and created an injury like a twisted ankle in slow motion. I have been making a point of not doing that anymore that same way, and catching myself when i do and immediately shifting my weight. And slowly the swelling went away mostly. I don't walk enough is also the problem.
So that's my first check, to see if it's not something local to the legs rather than a kidney issue or something. If it was a kidney, it would still be there after I check the lesser possibilities.
So laddie, I sincerely hope you feel better, and maybe you can shift and not fall asleep in a chair so much (if you do). Maybe that will help. But take care of yourself and get checked up if this is new. Can you call an advice nurse or something over there with your health care system? Save you the trip perhaps.
Be well. PoseDrawSki says, "Nice drawings, Mr Ploos!"
ˇVaya con a big fat foot all the better to kick a ball!
"Not a bit is wasted and the best is yet to come. . ." -- remembered from a dream