Hello and welcome,
After extraction of teeth it usually takes 3 to 4 days for the complete healing and closure of the socket if there is no super infection . As you have complaint of pain and swelling below the tongue 3 days post extraction, i can suspect some kind of infection in the extraction area that has spread to adjacent tissue. it may even progress to abscess
Exact diagnosis can be made only after visual examination and radiographs. i suggest you to visit a dentist
soon before the condition gets worse.
Meantime you can start with Amoxycillin
with clavulate tablets and diclofenac
two times daily which will definitly subside the swelling and pain.
i hope this helps you, take care.