I think I may be dealing with this. Does it cause pain in the soft part of your arch?
That is where it started for me. not long after it spread to pain in my heels. First noticeable in the morning when I got up.
I, stupidly, did not go get it treated at that point so now it's a "thing" I have to cope with. It's being treated now and I hope to have it beat in a few more months.
But I am better. Walked around all day at an amusement park and was fine the next day. Today I hurt because I was not wearing shoes with my inserts in them as I did yardwork. So, my bad.
If you think you have it do a few things: 1) pull your toes back gently a few times per day to stretch the plantar thingy. 2) stretch your calves. Tight calves make it worse. 3) freeze a water bottle and roll your foot on it a few times a day to reduce inflammation (plus that just feels awesome if the arches are hurting).