You look overwrought when your feelings have been pushed too far — you are very upset, very nervous, and you cannot settle. People use it for someone whose voice shakes, who cannot sit still, or who starts crying over something small after a long strain. It is a rather bookish word; a doctor or a novelist might say it, while everyday talk is more often “stressed out” or “a mess.” Though actually the pieces tell an older story: wrought is an old past form of work, so overwrought first meant “worked too much,” the way metal is wrought when it is hammered again and again. The feelings sense grew from that — the mind has been hammered too much.