Swelling will not subside , u need to take antibiotics and pain killers , along with local application of 0.1percent kenacort  and mucopain , before meals .

Don't panic. That's a huge swelling though. The blood supply of the mouth is plenty and usually wounds like this heals fast. Switch to cold diet. Apply ice cubes over it often. You can apply dologel/ mucopain topically- SOS. It will take 7-10 days time but it will heal. Donot touch with hand or tongue. The whitish layer mostly is the tongue coat