What should I do if I have lockjaw-like problem?

Rock and slide jaw. This is due to dysfunction of the temporal mandibular joint just below the ear. The cartilage catches on the other side of the joint and clicks as the joint moves. Sometimes the cartilage catches the other side and the jaw locks. If this starts to happen, do not try to close the morth - but keep it open, rock the joint from side to side and yawn and usually the jaw will snap into place.