In reply to GDes:
I run a bit. I had this (what I think anyway) bad a few years ago - I was limping at work.
Physio told me my problem was probably over use + small injury that had then gone a bit chronic due to failure to allow it to heal. Physio explained that my biggest problem was that the Platar Fasciitis is used to walk i.e. if its all inflamed/sore then just walking around can be enough to stop it healing and make it go chronic.
Physio explained that, in my case, stopping using it completely (crutches) would allow it to heal but still working wasn't going to work. (10,000 steps a day - 5,000 steps per foot? Could be right... ?) I had been stopped running for ~3 weeks by the time I went to see the Physio and felt it was actually getting worse.
Physio gave me this and it was fixed quickly: https://www.rdash.nhs.uk/wp-content/uploads/2016/12/Plantar-fascitis-taping... You'll find YouTube videos for the same thing. Kind of a pain to do it yourself first time round ... but get the hang over it afterwards.
Physio's explanation was that this basically relieved the Plantar Fasciitis from being in use while walking. If you aren't using it - it will heal. Does feel a little odd under your socks.
I honestly felt better the minute I taped it up (I guess maybe the Physio knew what they were talking about when they said this would take the Platar Fasciitis out of action ). I was running lightly maybe 3 weeks later again. Need to work back into distance pretty slowly - build it up +1-2 km at a time. Minute you feel a twinge - back off, tape it up, rest it, start over. I could definitely "feel" it when I started to come back to running - it wasn't gone away for a while.
If I feel a twinge now I tape it up for a day or two proactively and I've never had it come back.
It's the same tape as you use on our fingers for climbing. Don't buy the over priced colored stuff for climbing . Search Amazon for "zinc oxide tape" and you can buy giant roles there. Get the widest stuff you can get - will mean less time/effort to get your foot strapped up.
May be irrelevant - I have big feet (12) and low/flatish arches. Those with similar feet are apparently prone to this type of injury according to the Physio.
Cheers
Post edited at 13:35