If you read the post, he is already seeing a dentist.
He is waiting on a new cap to be delivered..He broke the temporary..and they stuck his old cap back on..
Unlikely it’s infected..but it could get that way..
I’ve had many many many crowns and crowns replace over the course of my life. I have never had a tooth hurt unless it was broken or infected. Unless the temporary is causing his gums to swell. But that’s noticeable.