As someone who had 2.5 years of Plantar Fasciitis recovery, I can share your pain and frustration. It is a stubborn one for sure!
For now, check out your options. You may be able to defer the marathon until next year, if it ends up that it isn't going to happen this year. If you do get to run it, you may also want to adjust your time goals, as taking 2-3 weeks off of training will put you back some.
I'm sorry this has happened so close to the race. I hope that you recover well.
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