Hello & welcome,
Since you extracted your tooth due to extreme swelling, means there was severe infection in surrounding tissue & tooth being the main focus of the infection.
What so ever may be the reason, you first need to undergo incision & drainage
if the swelling has been from more than two weeks.
Remember one important thing, Long term use of Antibiotics drugs without swelling being drained properly with an incision or after extraction, makes that swelling to indurate or become hard ( called as Antibioma ) which then will take more than 3 months approximately to resolve completely.
Get an x-ray done by visiting to your dentist
to check whether there is any remaining root piece which might get infected & cause swelling & pain.
If there is any remaining root piece in the socket, removal of the same would resolve the condition immediately, but if no root piece is there, then ideally incision & drainage should be properly done. For the same reason, you can visit Oral & Maxillofacial surgeon who may help you regarding this issue.
Since swelling is doubled in past two days, that clearly means you cant rule out infection due to oral antibiotics
. You may need Antibiotics given through intra venous rout which will have faster results in your case. But off course these drugs will be given to you only by your Oral surgeon or dentist.