Pain in your sole is Plantar Fascitis - well, Ithink it is - not being a doctor, but knowing full well what you are describing.
I have very horrible feet and find that Fit Flop have some ( very expensive) shoes that are the most comfortable I can find. And if your feet are wide or even if not, DB Wider Fit shoes have a range of sandals and other shoes - not as pricey as Fit Flop and I've just received their latest catalogue which has quite a lot of reduced prices. They have their own special way of measuring your feet too.