Harry is a director of Aware, and the author of several bestselling books including Flagging Anxiety and Panic, which is out this week.
Dr Barry says he wrote the book because he has encountered so many people whose lives have been paralysed by panic attacks and fear of social interaction.
"I have been contacted by people who are trapped in their homes because they are afraid they will have a panic attack if they leave”.
He spoke to Matt earlier, listen back here:
