Hey. I'm a 35 year old male who had the same situation minus some allergies and acne, I also smoke a lot of weed and drink once in a while. I spent a lot of my life trying to find solutions at different times through self research and I think I finally stumbled upon the cure, at least in my case.
While I was in Japan with my wife we went and got a full checkup, and a dermatologist prescribed antifungal pills (these are cheap by the way - a month prescription is like 10 bux) for the tinea versicolor. After about a month of daily use, my tinea is starting to visibly clear up, but my halitosis issues seem to be almost completely disappeared. Funky clinging smell in the room after sleeping is gone, so is the car air conditioner smell. Still some PND, but not much - the mucous is watery and clear now, and my tongue is much less white. Energy levels are also up. I'll be on this medication for another month or two until the versicolor clears up completely, hoping to start a new chapter in my life free of halitosis... and man does that feel good.
My personal suspicion about why I had this problem most of my life is: I believe that Antibiotic treatment at a very young age whiped out my gut, and yeast took over from there.