I am so sorry to hear that you are having so much trouble with your asthma. It does sound like you went down the same path I did.
Does your doctor have you on Xolair? It has helped me a lot. I am not going to tell you that I don't still have to occasionally have to take Prednisone, because I do. I also still get bronchitis, but not anything like I did before Xolair.
I take an injection monthly and it cost about $10,000 per year. I think that about every insurance company is now paying for it for severe asthmatics because it is cheaper in the long run for them because they are not having to pay for ER visits or in-patient hospital stays.
If you are not on Xolair, I would strongly advise you to talk with your doctor about this. Please keep me posted. I certainly understand what you are going through.