I got punched in the face and my eye swelled up bad that i can't see. what can i do to unswell it quickly?

Cold temp: Rest, ice, compression, elevation (treatment for swelling). Should improve with time.

Go to the E.R.: Although you may only have swelling, you run the risk of fractured facial bones. If one of the bones in the eye socket is broken, it can lead to problems moving the eye. Also, if the punch hit the eye socket, there is a chance that the eye was injured. You should go to the emergency room to have your injury evaluated.