I suspect you'll need a root canal re-do
I've had 2 teeth re-develop pain years after previous root canals in same teeth. Endodontist (who was excellent) diagnosed failed root canals. He re-did root canals and teeth are now fine. He drilled through previous gold crowns, so no added expense of new crowns. I recommend you do what is necessary to save your tooth regardless of expense, so you don't end up losing it and needing an implant.
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