The presence of upper back pain
does not mean that it is due to lung collapse.
It can be attributed to the the fatigue
of muscles of respiration due to strenuous breathing.
Symptomatic relief from allergic asthma
can be achieved by:
1. Avoidance of the allergens
4. Steroids(if needed)
preparation for maintenance
To strengthen your immune system & build up tolerance to house dust mite and other allergens, Immunotherapy
can be undertaken, as your allergist has recommended.
And you are right, dusty places are usually associated with more dust mites.
So...you need to keep yourself well protected from exposure to dust & other allergens.
Wishing you a Good Health. Let me know if I need to clarify further.
Thanks & take care.