I would recommend getting an opinion from a orofacial/craniofacial pain dental specialist. Your pain could be referred from muscles. Pain this intense from a tooth will not be resolved with a crown anyway. Crowns are used to restore structural integrity to the tooth, not treat pain. "Cracked teeth" can cause pain from biting and need crowns, but to be in pain all the time and having it escalate is either pulpal (nerve inside of tooth) which was ruled out by the endodontist, or referred pain(Neuralgias have a different pain quality than you are describing). It will take only a few minutes by a well trained specialist to be able to make that diagnosis. Pulpal pain causes thermal sensitivity (hot and/or cold causes pain), and biting pressure pain. One last thing--if the pain went away with the local anesthetic then it is probably pulpal pain and root canal therapy (endodontics) should eliminate the pain. But get another opinion instead of living (miserably) on pain pills. Crowns won't eliminate pain and conversely should be mostly a painless procedure post operatively. TMJDoc
Seeing an occlusionist or prosthodontist to hvae occlusal adjustment of new restoration is advised. You may need a crown redone if inaccuracy can not be corrected.