Running every day is not something that you should do until you have built yourself up to it. Even then, it's always a good idea to let your body rest at least one day.
As far as your left foot going numb, I have no idea.. Never heard of that before. More than likely it is due to over stressing it by running every day though. Also, if you haven't been to a quality running store to get fitted for good running shoes, you should. A pair of shoes that fits your feet can make all the difference in the world, and prevent any number of serious injuries from occuring.
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