I would be going straight to a podiatrist, particularly with experience with sport based, custom orthotics.

I've had to wear custom orthotics in all my shoes (except for dress shoes which just doesn't work. That's okay for 4-5 hrs. of wear and not walking extensively much at all. ie. at a party.) and boots for the last 20 years. I wear them for snowshoeing, cycling, hiking, etc. If I don't wear any for a few consecutive days, my feet are in pain after only 15 min. of walking. I will have to wear orthotics for the rest of my life.