Pain: veneer bite adjustment, unclear x-ray, what next?

Had a bite adjustment to the left lateral incisor. Pain had been excruciating/throbbing. Before bite reviewed and adjusted, X-ray was carried out - there was a vv small grey area that he couldn’t distinguish if it was nerve damage. I was told that if the bite doesn’t work then it’s root canal. How long after a bite adjustment should I give pain to subside? It still feels as bad as before, hours later, that I am contemplating an emergency treatment.