Asthma medications can deplete minerals and key vitamins like C & D (not sure about B). Have you tried supplementation (especially of minerals)?
I'm a music teacher, and not a doctor. Anything I post is based on my own experience and lay opinion.
Lyme, Babesiosis, Mycoplasma (Asthma), Fibromyalgia (Soft Tissue Injury), Costochondritis,
CFS (Mitochondrial Dysfunction), IBS (Candida), Hashimoto's Thyroiditis, Adrenal Fatigue,
ITP (Low Platelets), TMJ, Plantar Fasciitis, Schamberg Purpura, Tinnitis, Allergies, MCS