Looks to be related to bronchospasm
I have gone through your history and the medication you are on. Your description is self exploratory. If Ipratropium bromide
is helping to ease your symptom of tightness, it may be a referred sensation form the spasm of muscles of the airway. Ipratropium helps to relax the muscles of the airways. Just to add to your knowledge- if a proper broncho-dilatation is maintained by you by appropriate use of Advair
and Ipratropium, the requirement of other medicines may be reduced drastically as is for the relief of the sensation of tightness.