Hi I've Had Root Treatment And A Crown In One

Hi I've had root treatment and a crown in one of my bottom teeth, I've now ended up having root treatment in the tooth next to it , but I'm still in so much pain with the tooth that is crowned, it is so sensitive to anything hot it hurts when I now eat on it and I have a stinging sensation along my gums , this has been going on for over 5 months now !