I had the exact same thing happen to me last summer. After not suffering from asthma for many years since leaving California (I think this is the key word), last year I suddenly developed severe asthma on taking a trip to California from Texas. I think it may be the change in location, the air quality. I became extremely ill, actually hospitalized for one week. After my hospital stay, I was still having severe problems, so what I did was nebulize with colloidal silver, lobelia, and I took a product by the name of Clear Lungs that expectorates congestion. This got me feeling fine in a week but the thing is I had to continue nebulizing and taking Clear Lungs because if I stopped the asthma would come back.
When I came back to Texas the asthma disappeared and I have not been bothered since.
I know what you are going through. By the way, I got my colloidal silver from http://www.utopiasilver.com and they have a special offer if you are a first time buyer where you get one free bottle of colloidal silver for every 8 oz bottle ordered. But you must call them to receive this offer. They also have lobelia and Clear Lungs.