I had an allergic reaction to some food 3 days ago & my tongue looks & feels like i burned it on something hot. could this still be from the allergy?

Yes: Not uncommon for the symptoms and signs to persist for several days.

Allergy?: We’re you diagnosed as having an allergic reaction, or was it a self diagnosis? Could it be a non-allergic reaction to acids, oils, or texture of the food substance? Yes, symptoms can last days to weeks. Would be good idea to see your GP or Urgent Care to try to determine cause of symptoms.