I had bronchitis about 4 years ago.. and it lasted 4 months. yes.. 4 months. I was soo sick that i thought I was going to die. My dr did give me antibiotics, breathing treatments, inhalers and predisone. None of it helped. It just varies on people, some may have a mild case, moderate or severe. What I had was severe. I also was a smoker too. I don't smoke now, but to look back.. it was pretty bad.
Maybe you need to go see your family dr and tell them you want a second opinion or refer you to a specialist for asthmatics. The specialist can tell you more and perhaps give you the right medicine. It does lead you to pnemonia if you don't take care of yourself. It's really a life or death situation once you catch pnemonia. Go see a specialist.
let me know how you're doing and what the dr says.