Unexplainable pain & burning tears after RCT & crown placement. What can I do?

6 years ago had root canal & crown on tooth #19. Not sure of crown material. Ever since, I've had an off & on throbbing tooth pain & burning sensation on my tongue in the area. I'll be good for a few weeks then it comes back for a few days. The tooth pain & burning tongue go hand in hand, never one without the other. Goes away at night. No response to pain relievers. Multiple dentists say looks ok. Affecting my quality of life. Considering crown replacement.