I work at a therapeutic riding barn so I'm at one ALL. DAY. LONG. Then on top of that I recently developed plantars fasciitis. I had to quit playing rugby, stop wearing boots when I'm not riding and also stay off them as much as possible. I haven't seen a doctor yet but when I get my health insurance back its definitely in the cars and I would recommend seeing one too.
In the mean time Avis makes a shoes with a white foam for cushion then a grey foam at the arch. They are very comfortable. I can usually work about in them from about 9-4pm.
Also look into kinesio tape. It stretches and helps to prevent/enhance muscle performance. For plantars fasciitis you start by taking a strip at tape and putting it on the ball of you foot. Stretch it and stick it down to to the back of your heel. Then let the tape relax and put the rest up your clalf. That prevents the fascia from over extending because the tape will not allow it to stretch very far. Then you take a second piece anchor it to the outside top of your foot and wrap it tight across your arch and up the inside of your ankle. That will provide support and once again keep it from falling. Don't worry, the tape comes with directions in the box!! Also, you can find A LOT of info online. The tape is not cheap BUT it does last about 4 days, even through showers... Even through things you would prefer it didn't last through like sweaty, wet, muddy, gross rugby practice!! It definitely *helped* (not cured) the pain and stress in my feet.
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