Welcome to the forum, cindykite.
Nobody seems to have any info for you on holistic medical centers. I don't either. What sort of doctors have you seen? Why did one prescribe Dulera?
On Drugs.com I read this drug can make asthma worse and give you hoarseness. You might want to look it up yourself.
If you have a serious medical condition I wouldn't be looking for an alternative provider. I trust my allergist even though somethings don't work for me. A lot of treatment is trial and error. Hopefully not too many errors. It often takes some time to find just the right thing for each person.
I have 2 typed pages of prescribed medications and their effects and another page of OTC meds. I keep track of the ones that DO work, not just the ones that don't.