Have you tried a uniform shop that sells shoes for nurses or other people who must stand a lot? There are also places, though they are PROBABLY outrageous, that are run by podiatrists and they sell custom made shoes as well.
If you really can't take it, I would tell your boss right away, TRY to stick it out till he finds someone. HELP him find someone. If your feet hurt, next it will be your back! Good luck and take care!
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