Maybe starting out with a bit less? If I try too much, at first, then it usually causes more pain/damage then any benefits. (In the past year I've had a lot of problem with foot pain.)
Also, maybe the oedema is from a medicine? We tried everything the past few months to dump some oedema leftover from pneumonia and various treatments...just this past week, we tracked it to a muscle relaxant which I have stopped and the swelling and pain is almost gone.