Bad breath is ruining my life🙁

Over this past 6 months people around me have said my breath stinks. This was extremely hard for me to believe because I thought I had great oral hygiene. So I started stepping it up. I now floss with both string and water, brush and scrape my tongue, and use a fresh breath mouthwash. My breath problem hasn’t gotten any better. It’s gotten to the point where I cannot talk to people face to face because I’m self conscious about the smell. I’ve come to think it has to be something with my stomach. Any have any tips?

EDIT: wow didn’t expect this to blow up and sorry for not editing this earlier. I do visit my dentist every 6monthes and have no idea why I haven’t brought it up to them. I’ve had issues with acid reflux in the past, and will definitely bring it up. THANKS