The medications will most likely make your asthma WORSE, because they only address the SYMPTOMS of your problem, and not deal with the root cause.
They will almost definitely make your fibromyalgia worse.
Many non-traditional medical professionals have proven that Candida does indeed contribute to asthma. Because traditional doctors are trained by institutions that receive huge grants from pharmaceutical companies (who are trying to sell you their drugs), they truly only learn what the drug companies WANT them to learn. (No doctor has the time to research everything for themselves, and most just rely on the aggressive ongoing "education" the drug companies provide through their sales people.)
Many asthma problems are solved by diet and lifestyle changes. Chances are, your fibromyalgia would be helped by this as well.
Hope this helps,