Help! I can't get rid of my bad breath!?

I suffer from chronic halitosis, very chronic. I've tried Breath Rx, Smart Mouth, and I'm currently testing the TheraBreath system. None of these have proved to cure my halitosis. I spend 10 minutes brushing my teeth, twice a day, beginning with scraping my tongue with a larger tongue scr, then a small scr provided in the TheraBreath starter kit, with TheraBreath toothpaste on it. I then brush my teeth, brushing my teeth, gums, cheeks, top of my mouth, and lastly, my tongue. I then rinse with the oral rinse provided by TheraBreath, and gargle with the ActivOxygen rinse. I use the extinguisher spray, nasal spray, and extra strength drops on the back of my tongue. As I brush my teeth, there is a very large quantity of mucus formed. I figured that because of this symptom, my bad breath was due to post nasal drip. However, that does not seem to be the case anymore. I'm running out of options...help! I'm only 19..this shouldn't be!