Sports injury and needing advice PLEASE ANSWER?

I have been running a lot lately to get ready for a 5k. I'm not sure if my foot injury is the cause of running or something else. Anyways, it hurts near where my toes are. There was brusing and inflammation the first day but it has gone down. I can't put full weight on my foot or else it hurts really bad. What might this be and should i see a doctor?