Im due to have root c and its painfull now !?

i have had 3 dentist metting so far one to tell me im having a filling one to tell me im having rootc and one to tell me your nerve wont die so he put this thing on it to kill it and it hurts now not extreme like toothache i just want to push the tooth can somone with dental/rootc exp tell me whats wrong ?? im realy worrid