Has anyone experienced 'Airway Remodelling'?

Does anyone have any information about 'Airways Remodelling '...apparently when inflammation has been proceeding unchecked over some time and which results in airways thickening and narrowing and reduced lung capacity?

Have just had my specialist appt and he mentioned the above (which I had discovered existed for myself through research last year). I have increasing volumes of mucus production (3 cups/day) and recently am experiencing a lot of SOB. According to my spirometry I have lost 1L of lung function in recent years. We are trying to discover what is driving the loss. But my next appointment is several months away where he will presumably have the information he needs to know why this is suddenly getting worse and if there is anything I can do to intervene. I think I am down to 1.5L of oxygen capacity.

I have no idea how bad that is or whether allergies etc might be causing a reversible oxygen loss.

Any idea very much welcomed. @sue

I don't know whether he was diagnosis that Remodelling for me or whether it was a possiblity. We have done bloods, HRCT of both sinuses and lungs, sputum was negative.

When SOB I am finding an antihistamine has been helping.