I would like advice on my serious foot problems. symptomatic accessory navicular syndrome and flexible flatfoot?

I would look into : The hyprocure procedure which could be found on hyprocure.com. I find the procedure to be very helpful. Your actually not to far from me, so if you are interested in the procedure I am right over the bridge from you.

I suggest: Getting some physical therapy, custom orthotics. If that fails you can consider a surgical correction.