Intense pain when removing temporary crown from root canal

Hello, several weeks ago I had two root canals in two joining teeth. I had a temporary crown placed over both teeth for 3 weeks. When I had the temporary crown removed from the two teeth the dental assistant stated I should have no pain. When she pulled the temporary I almost passed out from the pain. Should this happen with root canals? Is it just my gums? They didn’t seem too concerned but I am concerned.