Shin Splints!

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So I'm training for a marathon, the last long run I did was my first time at 13 miles, it was last weekend. Since then my calves never really recovered and all week when i tried to run my right shin would get so tight I couldn't support my weight. It's been 3 days since my last run, I'm also getting a cold :/, how long should i take off? Will i effect me badly? Im also worried about gaining weight...since Thanksgiving is this week too. help?

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