I'm Having Difficulty Standing Or Walking Because Of Pain In

I'm having difficulty standing or walking because of pain in the ball of my foot ay the base of the middle toe. It feels like there is something deep beneath the surface. I feel it if I put my foot down or try to bend my toes. There is no redness or warmth and visually nothing to see at the site. Discomfort came on 2days ago and is not subsiding. It is not intermittent but constant. Suggestions?