So the doctor basically confirmed what I thought, I've hurt it by stepping too hard or something of that nature. He explained to me however that it will take 3 - 6 months to fully heal as where the arch is(I think he called it the fasci), it expands and contracts as you walk. Every morning when you get up, it basically tears all the healing that's been done overnight and therefore starts to hurt again.
He did say I don't have to cold turkey the minimalist shoes but he was pretty adamant about getting something with cushion. He highly recommended getting three stages of shoes, one with lots of padding and cushion, one with normal padding and cushion and then a minimalist shoe and kind of rotate through them, using the minimalist ones the least for the next while.
Initially, I was doing some research and though it might be a Lisfranc injury:http://www.aafp.org/afp/1998/0701/p118.html
But your doc said it had to do with the fasciia? Ouch! Hope it heals soon! At least he didn't dissuade you from minimalist running. I'd recommend staying away from minimalist shoes for about a month or two, and then introducing them into your routine only once a week after that. That was basically my transition program after my injury.