My mouth was numb I ended up biting the inside of my cheek and now a bit of flesh is hanging off of it. How long till it heals? How to ease the pain?

Healing. The mucosa of the mouth heals itself very well , but you also have to stop causing the irritation. For the pain you can take ibuprophen or Acetaminophen or even use ora gel to numb it. It will usually remodel itself aver a short time a week or more. If the flap is very big you may want to see your dentist.