halitophobia
n.— «At the organization’s recent global conference, halitophobia—also known as delusional halitosis or imagined bad breath—was identified as a vital area for future mouth malodour research.» —“Bad breath? Forget gum, you might need a shrink” by Misty Harris Times Colonist (Victoria, British Columbia, Canada) Oct. 11, 2007. (source: Double-Tongued Dictionary)
Further reading
Understanding the varieties of conversational styles can mean the difference between feeling you’re understood and being insulted. “High-involvement” speakers interrupt or talk along with someone else to signal their enthusiasm...