I feel your pain. I've been nursing a pain in my right arch for the past 2 weeks ever since a trial run with new boots.
Lesson learned: When testing new boots on a long hike (8 miles round trip), bring a pair of known good shoes so you can ditch the new boots once you've determined they won't work.
Those new boots went back to the store.
Fortunately, with some careful wrapping on the foot, the pain has gradually gone away to the point I will probably not bother wrapping it next week to see how it is without the wrap.
Short hike tomorrow, so that'll be a test of how it feels on the trail.
If you only have 11 days before your hike, I'd recommend seeing the doctor just to be sure there's nothing major wrong. I've had the luxury of knowing I had 4 weeks till my first possible start date for my 7 day hike from OV to Whitney, so haven't seen my doctor yet.
I echo the suggestion above about finding the right insert for your shoes (although this close to your hike, it might be too late to experiment with various inserts). I don't even use the regular inserts in my everyday shoes.
