Left side of left foot pain

I started walking again after I had stopped for a while and as I began my walk yesterday the left side of my left foot had a sharp pain.
I continued to walk and when I got home I noticed that I could barely put pressure on the foot at all.
I went to work which is of course standing and limped around and tried to put my weight on my other foot.
When I got up this morning it was hurting more than yesterday.
Should I walk it out or try not to put weight on it.
I have a lot of walking to do today at school.