I had a root canal and crown on and am experiencing bad pain, 3 weeks post op. What should I do?

I had a root canal done at the end of October, in the beginning of November I had to get another small root taken out..i had a temp crown put on right before thanksgiving and then got my crown put on December 16th. At first when o got the crown put on it instantly felt better..i felt some pain when i had the temp crown on..but now the crown is on, it hurts to floss, it sometimes hurts to chew. the only way to describe the pain is like a cut or needle..i will call the dentist. What should I do