I bit the inside of my cheek REALLY hard multiply times that its sore and is cut inside. What do I do to help my cheek heal?

An old trick to heal cuts and sores  is to take a small cotton ball or pad and dampen it with whiskey or any other alcohol and place into your mouth covering the cut for 10-15 minutes and it will numb it down for a couple hours. And you can do this multiple times a day but you also need to clean it multiple times a day to keep out bacteria spreading through the walls of the cheek and it will soon heal. Hope this helps!
P.S don't go too crazy on the alcohol! ;)