Question about hurt foot

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I've been doing 5k training for the last couple weeks, and recently the top part of left my foot hurts. The only way I can describe it is it feels like its crunching inside when I bend my toes up. And my left calf hurts as well. Its not unbearable, its just really annoying and feels like a charlie horse kinda. I was thinking Tendonitis? What are your thoughts? Thanks :) ( I also have really high arches, I dont know if this is contributing to this or not)