Been hit with the same symptoms as you are all describing several times now, pain killers alone were not helping and most things I read said a cold compress may help (didn't) however a heat pad, the large ones that you can get wrap around ones for back pain, tied around the foot for 6 hours really improved it, obviously try and rest the foot
during this treatment
, and as it starts to improve, gently stretch the foot
. Don't know what causes it and at the time when it hurts I don't care!