How to help my swollen foot?

Earlier today I accidentally dropped a 20 pounds metal "thing" (I don't even know how to describe it) on my foot. I'm a tall but petite girl so it was heavy for me. At first it was just bleeding a lot and it hurt but it wasn't unbearable. I had a concert to go to tonight so I decided to limp through the pain and go anyway. Well by the end of it I couldn't wait to get back to the car. When I got home my foot hurt so bad I couldn't even put it down. It's swollen and black and blue. I have a really busy week ahead starting tomorrow. Ive never had an injury like this happen before so I don't know what to do! Can it possibly feel better soon? Should I go to the doctor? (which I would rather not do if it could heal on it's own) Any advice is welcome! I am going to elevate it for the night though... :/