I Injured My Shin When It Met With A Fast

I injured my shin when it met with a fast flying frisbee last Friday; it immediately blew up to look like a second knee. I iced it for two days and elevated when i could. 4 days later the inside of my ankle became swollen and green and blue. The swelling at the injury site has gone down (not all the way but much better), still painful but able to walk, just cannot stand on it for long before it begins throbbing. I'm concerned about the swelling. Is this just the pooling of blood from the injury? And is there anything other than elevating it that i should be aware of with the ankle? Thank you for your help. Michelle