do i have a concussion?!

I was at work today, i work with dogs, i got head butted by a dobermen pincher to the middle/right side of my forhead and eye. His head hit me with good force, about 130lbs of dog. As soon as i got hit i walked away, imediately feeling nauseated, severe4 head ache, and a little out of it. i have lots of swelling in the area on my head and the cornor between my nose and eye is now purple. I have now waited about 11 hours since this happened. I still feel very nauseated and pain obviously in the area... which is still swollen. I am debating weather to go to the doctors.... what should i do....