What should i do for pain from a broken back that accrued years ago?

First find source: First, one must make sure your symptoms are related to an old fracture. Most heal without any consequence but sometimes other structures were also injured but were not part of the initial pain but became problematic over time like a disc. Sometimes a fracture heals in a way that alters the mechanics of the spine creating the pain. Treatment would be based on the reason for the pain.