Dark Recess by George O. Smith

Clifford Maculay was the one man who could explain the curious shift in the universe, which was far more than the academic matter it seemed to be. But Maculay had been "cured", and was no longer interested....

There are two basic ways to treat personality difficulties. One: change the personality. Two: remove the psychic blocks which are at the root of the trouble. The first method may be simpler, in some cases, and may be accomplished without apparent harm. But what if an individual's worth to society is so entangled with his personality troubles that when you change the latter, the former disappears, too?