Bruising that bad should be seen by a doctor, and the swelling should also be examined. There are more things than bones to worry about in your foot--ligaments and tendons besides. If you can't put weight on it, after day 5, it's likely that something happened that is more than a sprain.
And yes, there is something a doctor could do for you: prevent lasting nerve damage, prevent lasting damage to your ligaments and tendons, and if something is broken, prevent it from setting wrong. And pain pills. Which are always good.
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If I am not better, at least I am different. --Jean-Jacques Rousseau
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