My physiotherapist suggested the reason only Ventolin relieves my breathing and tightness is because I breath wrong with my mouth. She thinks because I have a dodgy breathing pattern I get the air trapping and hyperinflation we saw on the chest x-ray and lung function tests leading to chest muscle tension. The tension radiates up my back and neck making my nose feel 'blocked.' The Ventolin relaxes my chest and I can breath deeper using my nose. This may be why I often wake up ok in the morning before I start thinking about my breathing, although I do tend to gasp in my sleep a lot which is still unexplained. It may also explain why I do better in the warmth.
We don't know if asthma is behind the air trapping but apparantly anxiety and overbreathing can cause air trapping too. Right? This is where I need some insight please! First I've heard of this all but I don't want to get my hopes up if my physio is wrong-! I am a very tall and skinny young male so I don't know if the air trapping we discovered is just a red herring or not.