Uh Oh!!!! First injury :-|

I was being SOOOOO careful for months. And if you know me, you know that it has been a great accomplishment (well except for my two bowling incidents). Anywho, I have an 8-mile walk in the morning that I am really looking forward too, except I think I may have a nagging injury that may get in the way. I stubbed my toe REALLY HARD on a cabinet at work, and I am not sure that I will be able to withstand the constant impact of my toe on the inside of my shoe for 8 miles. Does anyone have any suggestions?