Just when I commit......my foot is hurt!

I can't believe that I decide to make it official yesterday for my fundraising and..... yesterday, my right foot started to ache. Soon after, sharp shooting pains all day. I haven't run since Saturday and suddenly I have my first injury. Today the pain is bad. I am walking with a limp. I can't run and have to rest it but that is not going to happen! I am very upset but need to calm down and just rest it for a few days. Ahhhhhh!