You searched for: “ergomania
An obsessive zeal for or a compulsion to be constantly at work.

The correct term for over work instead of the commonly used “workaholic“ which is etymologically wrong.

An ergomaniac works right up until the end of his life.

This image represents an ergomaniac who worked right up to the point of this last entry and so signifies his efforts to complete his last project even to the very end of his existence! It may also be said that he represents the ultimate in persistence (or stupidity).