Bad breath-no cure

Hello to all. I have been a chronic bad breath sufferer for as long as I can remember. I couldn't find any tonsil stones on my tonsils but they stink like poo. I coughed some tonsil stones up though. I maintain really good oral hygiene but still find that I never have a clean tongue after scraping it. I always cough up mucus so I'm thinking I could have pnd(post nasal drip). I have thread worms at the moment so I don't know if this could somehow be related. I constantly get headaches and stomachaches so I dont know if there could be a problem that has anything to do with my bad breath. Tweet