A second difference between the adjustment disorder with depressed mood and other depressions is that the symptoms only last a short time after the stressful situation ends.
Even though asthma is not considered an autoimmune disease, it is a chronic illness which requires the same attention as any other chronic illness. If you have asthma and an autoimmune disease, it is important to keep both under control to prevent one disease from affecting the other.
Because the early phase of asthma essentially involves mast cell degranulation and the immediate, direct effects of their released contents... anything that can inhibit these will be beneficial. Sympathomimmetics will inhibit mast cell degranulation by binding B2 receptors. Antimuscarinics will reduce the parasympathetic bronchoconstrictive effect.