My foot hurts...

I don't know why, or what exactly hurts, but something in my left foot is making my runs most uncomfortable. It started on Christmas day during my run through the snow, and although I have switched the inserts in my shoes, it hasn't gone away. I've tried taking a couple of days off, but I fear if I take too much time off, I'll be way behind. It only hurts when I run, right in my arch. I am getting really sick of it-- it's putting quite a cramp in my style.

This is more of a vent than anything. It's not unbearable, so I am continuing to run through it, but if any of you have any ideas on how to make the hurting stop, I am willing to try it.