My feet, especially my left one, feels like there are marbles under the ball of my foot.
Many of the coaches in my running group are in school for the Doctorate of Physical Therapy. My coach worked on my feet. Basically I have some tight muscles in my calves, some ITB issues, and had some bones out of place in my feet. She put them back in place--those were the marbles I was feeling and the pain in my feet during the race.
I need orthotics. I'll work on getting those soon.