hello there and welcome ,
After going through your history i suggest you to get the root canal treatment
done for your infected tooth from an endodontist, a specialist in root canal procedures.
Getting new crowns over the tooth will not solve the problem as the problem is not with the crown placement but is with the vital canal in the tooth that is left unexplored.
If its a molar tooth upper or lower , it will have 3 or sometimes 4 canals , they need to be explored , cleaned , shaped and filled till the apex , this procedures devitalises the tooth completely ans it seals the apex of the tooth from the surrounding tissues so there is no question of pain and infection to the tooth once the root canal is done properly. then you can go ahead for crown coverage over the tooth just to give mechanical strength to the tooth to withstand biting forces. Re exploring the canals and removing the infection will only subside your symptoms.
i hope this information helps you ,