Call dentist’s office. Usually there is a message on there to call “x” number if emergency. Cal that number. Doc should order pain killer like hydrocodone and maybe antibiotic if doc thinks it is infected. Take the pain killer and antibiotic if given, put on oragel or Walgreens oral gel after taking pills. Then, put on music you like and lie back and close eyes. The oral gel of whichever kind will knock down the pain until the pain pill takes over but you can still keep putting oral gel on it should the pain begin to come back. Take pain pill as ordered and use oral gel until doc can fix it.
I agree, I think it’s getting infected. He should call a dentist or see a doc in the box ASAP. That’s nothing to play around with.