Thanks for the query to H.C.M. Forum.
It seems that , you have asthmatic allergic bronchitis
( A A B), with super added another infection.
As you stated that there is no relief with prednisolone
and inhalers , so in my opinion , take most potent BRONCHODILATORS + ANTIHISTAMINE , after the advice of your treating doctor.
If possible up load X ray
report ( get in as early as possible) .
As far as pain in spine ,may be due to infection in lung, which has spread to spine.
Pott's spine is one most important cause in this type of symptoms.
Once again consult one more physician and get 2nd opinion.
Hope I have answered your question.
If further any question I will help.
Get well soon.