It is possible to fracture your tooth which would
cause pain like you described.
Decay would show on an xray, but a fractured
tooth likely would not. The jaw pain and ringing in ear is also telling. Root fractures are among the most difficult things for a dentist to diagnose and extraction of the tooth is the only true remedy. I don't mean to alarm you and I hope this is not the case, but if nothing else seems to work, this should become a part of your conversation. Best wishes.