My Son Has Anxiety And His Biggest Problem Is About

my son has anxiety and his biggest problem is about breathing. He cannot stop thinking about it. he just cant shut it off What can he di. He has been hospitalized and he has tried to commit suicide a couple of times Right now he is not working. For the first time he is starting to talk about it where before he was embarrassed and would not tell anyone what he was going through. Please help us. He is 26 years old and his name is Ben. bar