Bound by Suggestion — L.L. Bartlett

In exchange for helping her unlock the emotions of a disturbed young woman, psychiatrist Dr. Krista Marsh promises to cure Jeff Resnick's recurring headaches via hypnotism. Things start out rocky and quickly get worse when both the young girl and the doctor begin to manipulate Jeff. Soon he's experiencing the young woman's emotions and can't tell where hers leave off and his begin, and Krista has other reasons for ingratiating herself into Jeff's life. Meanwhile, Jeff's brother Richard is vying for a chairman seat on the hospital's fund-raising board. Two seemingly unrelated events that suddenly converge with deadly results