What can I do for this?

First, put an ice pack on it. You can get those "cold wraps" at the pharmacy. That should help with the swelling. The bruising will take time to go away. There are lots of bones in the foot....It could be there is something broken, or at least cracked. When the swelling goes down, if there is still a lot of pain, I think you need to get it x-rayed, just to be sure.