Affinity — J.N. Williamson

Indiana college student Quent Wilcox has had some disturbing nightmares, though he can't quite remember them when he wakes up. He's been stumbling across huge gaps in his memory, like what happened to his parents, and did he ever have a girlfriend? Not only is Quent losing his memory, but he gaining someone else's. Quent finds with his new memories come strange, unearthly powers -- and grave danger.