Reddit reviews Plantar Fasciitis Sock by Vive - Night Sock for Achilles Tendonitis & Heel Pain Relief - Support Stretch Therapy

Plantar fasciitis possibly, this this and this helped me greatly.

Plantar Fasciitis. I had this when I got to like 1,200 and was doing 22+ miles a day and when I went back down to 15 it still hurt. I'd put my feet up every mile or so for 5 minutes and put them in every cold stream just to break even. I ended up going to a podiatrist and got cortisone injections in each foot and he made me get boots because he said I walked like a model (tee hee). After the shots, I stood up in next morning walked to the bathroom and when I got their I realized my feet didn't hurt for the first time in a month. I took three days off then went down to 14 miles a day until my tramily caught up and never had pain again.

I had been using trail runners before that. I was resentful of the boots at first but come to love boots. If you stick with trail runners, I wouldn't wait until 500, I'd say every 400 or sooner honestly. Think about it this way, if you wait until 500 instead of 400 miles, wouldn't you pay a dollar every mile to not be in pain?

It's probably too late for these, but these can help for some people. It helped a little for me but not much. ( I had a different brand, but I don't image they're very different (don't get white!)).

https://www.amazon.com/Plantar-Fasciitis-Sock-Vive-Tendonitis/dp/B01N4WP79B/ref=sr_1_8_a_it?ie=UTF8&qid=1527257445&sr=8-8&keywords=Plantar+Fasciitis+Sock

Also, getting a cold can of soda and rolling it under each foot helps a little.