Ouch! I overtrained for a race a couple years ago and ended up w/ pretty severe PF in both feet that still flares up occasionally. (Like right now, as a matter of fact!)
Orthotics were out of the budget for me, too, so a few options that I used ( keeping in mind that everyone's different)...
Brooks or New Balance. And then, check the shoe. You need to feel a real uphill to the arch area in the footbed. If you have shoes that still have some time, but the footbed is collapsing, absolutely pull and replace with a stiffer one.
Tape your feet during the acute phase, and any time you've got an intense workout or are increasing mileage. (My podiatrist has me use paper tape).
Ice ice ice ice whenever you get back from a run. (That frozen water bottle trick is FOR REAL.)
Most importantly, once the acute phase has passed, listen to your feet. You'll start to get a weird little tickle/tingle from your arches sometimes. That's my cue to be careful of my mileage, put my stiffer inserts back in, and tape preventively.
Hope this helps!
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