I have had chronic bad breath for over 3 years

Patient : I have had chronic bad breath for over 3 years now, and can't get rid of it. i think it may be caused by post nasal drip, although I am not obviously allergic to anything. I also suspect I have tonsil stones, however I have only coughed them up once and cannot see any in my tonsils. I am so fed up as I've tried loads of mouthwashes (including therabreath), and still always have bad breath. Are there any allergies that might not be immediately obvious that I might have?
Symptoms:  Chronic bad breath. Also white throat
Images: 
I have had chronic bad brea...-1
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