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If this was your first visit you might just be sore from the visit itself. However, if more than 24 hrs have passed you should contact your dentist immediately as you might have more than one root...
Depending on how bad the infection is, you can get an RCT on an abscessed tooth. Unless the infection is bad enough to where you need to go to the ER either because of excruciating pain or a puss...
If you have had a root canal and the tooth that was removed still hurts, it is probably because the entire root wasn't removed or the drilling was not packed tightly enough. If that happens, another...