Is it really possible that a guy feels nauseaus and feelings of vomiting if his wife is pregnant?

Absolutely: Couvade syndrome is a term used to describe a situation in which an otherwise healthy man — whose partner is expecting a baby — experiences pregnancy-related symptoms. While some research suggests that couvade syndrome (sympathetic pregnancy) is common, it isn't a recognized mental illness or disease. Further studies are needed to determine whether couvade syndrome is physical or psychological.